Application as a maintainer (#25614)

Hi everyone,
as discussed in `#develop` I would like to apply as a maintainer.
I don't have that much in-depth knowledge of the codebase, but I would
like to help to review at least smaller PRs for the beginning.
Here is my PR list:
https://github.com/go-gitea/gitea/pulls?q=is%3Apr+author%3Adenyskon+is%3Amerged

MAINTAINERS

@@ -52,3 +52,4 @@ Xinyi Gong <[email protected]> (@HesterG)
 wxiaoguang <[email protected]> (@wxiaoguang)
 Gary Moon <[email protected]> (@garymoon)
 Philip Peterson <[email protected]> (@philip-peterson)
+Denys Konovalov <[email protected]> (@denyskon)