GitHub actions: Update version of actions/upload-artifact task (#10349)

GitHub actions is complaining that we are using an old, deprecated version of the `actions/upload-artifact` task.

.github/workflows/go-test-coverage.yml

@@ -86,7 +86,7 @@ jobs:
         sudo env "PATH=$PATH" make go-test-coverage
 
     - name: Upload test coverage
-      uses: actions/upload-artifact@v2.1.4
+      uses: actions/upload-artifact@v4
       with:
         name: TestCoverage
         path: toolkit/out/tools/test_coverage_report.html

.github/workflows/lint-specs.yml

@@ -95,7 +95,7 @@ jobs:
           fi
           exit 0
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         if: ${{ always() }}
         with:
           name: linted_specs