fix: setup go in test step

.github/workflows/test.yml

@@ -201,6 +201,10 @@ jobs:
         uses: actions/download-artifact@95815c38cf2ff2164869cbab79da8d1f422bc89e # v4
         with:
           name: mage_bin
+      - name: Set up Go
+        uses: actions/setup-go@0aaccfd150d50ccaeb58ebd88d36e91967a5f35b # v5
+        with:
+          go-version: stable
       - name: test
         env:
           VIKUNJA_TESTS_USE_CONFIG: ${{ matrix.db != 'sqlite-in-memory' && 1 || 0 }}