Update the sarif schema file

The version we were using is quite old. Copied the latest from
123e95847b/Schemata/sarif-schema-2.1.0.json

I do not think the sarif spec will be changing any more without
an explicit version update, so this is fine for now.

src/upload-lib.ts

@@ -225,8 +225,7 @@ export function countResultsInSarif(sarif: string): number {
 // Throws an error if the file is invalid.
 export function validateSarifFileSchema(sarifFilePath: string, logger: Logger) {
   const sarif = JSON.parse(fs.readFileSync(sarifFilePath, "utf8"));
-  const schema =
-    require("../src/sarif_v2.1.0_schema.json") as jsonschema.Schema;
+  const schema = require("../src/sarif-schema-2.1.0.json") as jsonschema.Schema;
 
   const result = new jsonschema.Validator().validate(sarif, schema);
   if (!result.valid) {