FIXUP: fix yaml syntax

Author: Totktonada

.github/workflows/test.yml

@@ -253,7 +253,7 @@ jobs:
   #   - checks: version, cached
   # - install 1.10 (nightly)
   #   - checks: version, cached
-  test-exact-version-nightly
+  test-exact-version-nightly:
     runs-on: ubuntu-latest
     env:
       TARANTOOL_CACHE_KEY_SUFFIX: -F-${{ github.run_id }}