fix(ci): setup go when testing so that go compile steps are cached

.github/workflows/test.yml

@@ -201,6 +201,10 @@ jobs:
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: mage_bin
+      - name: Set up Go
+        uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5
+        with:
+          go-version: stable
       - name: test
         env:
           VIKUNJA_TESTS_USE_CONFIG: ${{ matrix.db != 'sqlite-in-memory' && 1 || 0 }}