docs(platform/Gitea): Update PAT scopes for Gitea (#23615)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Co-authored-by: HonkingGoose <34918129+HonkingGoose@users.noreply.github.com>

lib/modules/platform/gitea/index.md

@@ -17,8 +17,13 @@ You must set `platform=gitea` in your Renovate config file.
 
 The PAT should have these permissions:
 
-- `repo`
-- `read:user` and `read:email`
+| Permission   | Valid for Gitea versions       |
+| ------------ | ------------------------------ |
+| `repo`       | all                            |
+| `read:user`  | all                            |
+| `issue`      | `>= 1.20.0`                    |
+| `read:email` | `<= 1.19.3`                    |
+| `read:misc`  | Only for `1.20.0` and `1.20.1` |
 
 If you use Gitea packages, add the `read:packages` scope.