Update Gitea CI workflow to downgrade upload and download artifact actions from v4 to v3

.gitea/workflows/ci.yaml

@@ -42,7 +42,7 @@ jobs:
         run: dotnet test classlib.tests/classlib.tests.csproj --configuration Release --no-build --verbosity normal --logger "trx;LogFileName=test-results.trx" --collect:"XPlat Code Coverage"
 
       - name: Upload test results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         if: always()
         with:
           name: test-results
@@ -89,7 +89,7 @@ jobs:
           cp -r images output/ps.ipam/
 
       - name: Upload module artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: ps.ipam-module
           path: output/ps.ipam/
@@ -102,7 +102,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/v')
     steps:
       - name: Download module artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: ps.ipam-module
           path: ps.ipam