ci: update Go version and GitHub Actions dependencies

Update CI workflows to use more flexible Go version handling and newer
action versions:

- Use 'go.mod' for Go version in diff.yml to automatically match project
  requirements instead of hardcoded 1.18
- Upgrade actions/upload-artifact from v3 to v4 in fuzz.yml
- Upgrade github/codeql-action from v2 to v3 in fuzz.yml

These changes ensure the CI pipeline uses the same Go version as specified
in the project and benefits from the latest improvements in GitHub Actions.

Signed-off-by: Ville Vesilehto <[email protected]>

Author: thevilledev

.github/workflows/diff.yml

@@ -8,10 +8,10 @@ jobs:
   bench:
     runs-on: ubuntu-latest
     steps:
-      - name: Setup Go 1.18
+      - name: Setup Go
         uses: actions/setup-go@v4
         with:
-          go-version: 1.18
+          go-version-file: 'go.mod'
       - name: Install benchstat
         run: go install golang.org/x/perf/cmd/benchstat@latest
 

.github/workflows/fuzz.yml

@@ -21,14 +21,14 @@ jobs:
           fuzz-seconds: 600
           output-sarif: true
       - name: Upload Crash
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: failure() && steps.build.outcome == 'success'
         with:
           name: artifacts
           path: ./out/artifacts
       - name: Upload Sarif
         if: always() && steps.build.outcome == 'success'
-        uses: github/codeql-action/upload-sarif@v2
+        uses: github/codeql-action/upload-sarif@v3
         with:
           # Path to SARIF file relative to the root of the repository
           sarif_file: cifuzz-sarif/results.sarif