openjfx21: 21.0.3-ga -> 21.0.3+2

Purely cosmetic change; these versions are identical.

pkgs/by-name/op/openjfx/21/source.json

···
   "hash": "sha256-7z0GIbkQwG9mXY9dssaicqaKpMo3FkNEpyAvkswoQQ4=",
   "owner": "openjdk",
   "repo": "jfx21u",
-  "rev": "21.0.3-ga"
+  "rev": "refs/tags/21.0.3+2"
 }