[CONFIG] [Github Actions] sonarcloud "security issues" fixed.

Author: Gonzalo Diaz

.github/workflows/dotnet-coverage.yml

@@ -35,6 +35,6 @@ jobs:
       - name: Test
         run: dotnet test --no-build --verbosity normal
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v5.4.3
+        uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24
         with:
           token: ${{ secrets.CODECOV_TOKEN }}

.github/workflows/snyk-code.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Restore dependencies
         run: dotnet restore algorithm_exercises_csharp.sln
       - name: Run Snyk to check for vulnerabilities
-        uses: snyk/actions/dotnet@master
+        uses: snyk/actions/dotnet@b98d498629f1c368650224d6d212bf7dfa89e4bf
         continue-on-error: true # To make sure that SARIF upload gets called
         env:
           SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}