Change v3 deprecation message to warning.

package-lock.json

@@ -1820,6 +1820,7 @@
       "resolved": "https://registry.npmjs.org/@octokit/core/-/core-7.0.6.tgz",
       "integrity": "sha512-DhGl4xMVFGVIyMwswXeyzdL4uXD5OGILGX5N8Y+f6W7LhC1Ze2poSNrkF/fedpVDHEEZ+PHFW0vL14I+mm8K3Q==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@octokit/auth-token": "^6.0.0",
         "@octokit/graphql": "^9.0.3",
@@ -1990,6 +1991,7 @@
       "resolved": "https://registry.npmjs.org/@octokit/core/-/core-5.2.2.tgz",
       "integrity": "sha512-/g2d4sW9nUDJOMz3mabVQvOGhVa4e/BN/Um7yca9Bb2XTzPPnfTWHWQg+IsEYO7M3Vx+EXvaM/I2pJWIMun1bg==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@octokit/auth-token": "^4.0.0",
         "@octokit/graphql": "^7.1.0",
@@ -2952,6 +2954,7 @@
       "integrity": "sha512-tK3GPFWbirvNgsNKto+UmB/cRtn6TZfyw0D6IKrW55n6Vbs7KJoZtI//kpTKzE/DUmmnAFD8/Ca46s7Obs92/w==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@typescript-eslint/scope-manager": "8.46.4",
         "@typescript-eslint/types": "8.46.4",
@@ -3635,6 +3638,7 @@
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.15.0.tgz",
       "integrity": "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg==",
       "dev": true,
+      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -4291,6 +4295,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "caniuse-lite": "^1.0.30001669",
         "electron-to-chromium": "^1.5.41",
@@ -5144,6 +5149,7 @@
       "resolved": "https://registry.npmjs.org/eslint/-/eslint-8.57.1.tgz",
       "integrity": "sha512-ypowyDxpVSYpkXr9WPv2PAZCtNip1Mv5KTW0SCurXv/9iOpcrH9PaqUElksqEB6pChqHGDRCFTyrZlGhnLNGiA==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.6.1",
@@ -5198,6 +5204,7 @@
       "version": "8.3.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "eslint-config-prettier": "bin/cli.js"
       },
@@ -5435,6 +5442,7 @@
       "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.29.1.tgz",
       "integrity": "sha512-BbPC0cuExzhiMo4Ff1BTVwHpjjv28C5R+btTOGaCRC7UEz801up0JadwkeSk5Ued6TG34uaczuVuH6qyy5YUxw==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "array-includes": "^3.1.7",
         "array.prototype.findlastindex": "^1.2.3",
@@ -7736,6 +7744,7 @@
       "resolved": "https://registry.npmjs.org/@octokit/core/-/core-7.0.6.tgz",
       "integrity": "sha512-DhGl4xMVFGVIyMwswXeyzdL4uXD5OGILGX5N8Y+f6W7LhC1Ze2poSNrkF/fedpVDHEEZ+PHFW0vL14I+mm8K3Q==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@octokit/auth-token": "^6.0.0",
         "@octokit/graphql": "^9.0.3",
@@ -8058,6 +8067,7 @@
       "integrity": "sha512-G+YdqtITVZmOJje6QkXQWzl3fSfMxFwm1tjTyo9exhkmWSqC4Yhd1+lug++IlR2mvRVAxEDDWYkQdeSztajqgg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -9067,6 +9077,7 @@
       "integrity": "sha512-M7BAV6Rlcy5u+m6oPhAPFgJTzAioX/6B0DxyvDlo9l8+T3nLKbrczg2WLUyzd45L8RqfUMyGPzekbMvX2Ldkwg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -9284,6 +9295,7 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "dev": true,
       "license": "Apache-2.0",
+      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -9357,6 +9369,7 @@
       "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.17.0.tgz",
       "integrity": "sha512-Drp39TXuUlD49F7ilHHCG7TTg8IkA+hxCuULdmzWYICxGXvDXmDmWEjJYZQYgf6l/TFfYNE167m7isnc3xlIEg==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@typescript-eslint/scope-manager": "8.17.0",
         "@typescript-eslint/types": "8.17.0",

src/util.test.ts

@@ -476,7 +476,7 @@ for (const [
     githubVersion,
   )}`;
   test(`checkActionVersion ${reportErrorDescription} for ${versionsDescription}`, async (t) => {
-    const warningSpy = sinon.spy(core, "error");
+    const warningSpy = sinon.spy(core, "warning");
     const versionStub = sinon
       .stub(api, "getGitHubVersion")
       .resolves(githubVersion);

src/util.ts

@@ -1141,7 +1141,7 @@ export function checkActionVersion(
           ">=3.20",
         ))
     ) {
-      core.error(
+      core.warning(
         "CodeQL Action v3 will be deprecated in December 2026. " +
           "Please update all occurrences of the CodeQL Action in your workflow files to v4. " +
           "For more information, see " +