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 <hestergong@gmail.com> (@HesterG)
 wxiaoguang <wxiaoguang@gmail.com> (@wxiaoguang)
 Gary Moon <gary@garymoon.net> (@garymoon)
 Philip Peterson <philip.c.peterson@gmail.com> (@philip-peterson)
+Denys Konovalov <kontakt@denyskon.de> (@denyskon)