fixup: revert codeql-action SHA bump (newer version regressed no-source-seen)

Bumping github/codeql-action from c6f9311 -> 2a1689e in PR #68's M4
track caused `analyze (javascript-typescript, none)` to fail with
"CodeQL could not process any code written in JavaScript/TypeScript"
where it previously succeeded on main.

The repo is Rust-primary; the JS/TS leg is intentionally a no-op
existence check that the older action treated as benign but the
newer action rejects as a fatal error.

Reverting codeql/{init,analyze,upload-sarif} to c6f9311 only; the
other 6 action SHA bumps (checkout, cache, upload-artifact, rust-cache,
scorecard-action) remain at HEAD. Will file a follow-up issue to
either (a) bump codeql with a build-mode that accepts empty JS/TS,
or (b) drop the JS/TS leg entirely from codeql.yml.

Author: hyperpolymath

.github/workflows/codeql.yml

@@ -38,12 +38,12 @@ jobs:
         uses: actions/checkout@1cce3390c2bfda521930d01229c073c7ff920824 # v6.0.2
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@2a1689ed43ccdf7eea07e03a75371ce6801d28e6 # v3
+        uses: github/codeql-action/init@c6f931105cb2c34c8f901cc885ba1e2e259cf745 # v3
         with:
           languages: ${{ matrix.language }}
           build-mode: ${{ matrix.build-mode }}
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@2a1689ed43ccdf7eea07e03a75371ce6801d28e6 # v3
+        uses: github/codeql-action/analyze@c6f931105cb2c34c8f901cc885ba1e2e259cf745 # v3
         with:
           category: "/language:${{ matrix.language }}"

.github/workflows/scorecard-enforcer.yml

@@ -39,7 +39,7 @@ jobs:
           publish_results: true
 
       - name: Upload SARIF
-        uses: github/codeql-action/upload-sarif@2a1689ed43ccdf7eea07e03a75371ce6801d28e6 # v4
+        uses: github/codeql-action/upload-sarif@c6f931105cb2c34c8f901cc885ba1e2e259cf745 # v4
         with:
           sarif_file: results.sarif