Enable bodyclose linter (#36168)

Enabe
[`bodyclose`](https://golangci-lint.run/docs/linters/configuration/#bodyclose).
The only issue in non-test code (`services/migrations/dump.go`) was a
false-positive and I think there are a number of undetected cases, but I
guess it's still better than not having it.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

services/migrations/gogs_test.go

@@ -27,6 +27,7 @@ func TestGogsDownloadRepo(t *testing.T) {
 		t.Skipf("visit test repo failed, ignored")
 		return
 	}
+	defer resp.Body.Close()
 	ctx := t.Context()
 	downloader := NewGogsDownloader(ctx, "https://try.gogs.io", "", "", gogsPersonalAccessToken, "lunnytest", "TESTREPO")
 	repo, err := downloader.GetRepoInfo(ctx)