Remove mramonleon as maintainer of git plugin and git-client plugin

https://github.com/MRamonLeon?tab=overview&from=2022-12-01&to=2022-12-31
shows no contributions to the git plugin or the git client plugin in
over 3 years.

Matching pull requestss to plugin pom files:

* jenkinsci/git-plugin#1655
* jenkinsci/git-client-plugin#1185

permissions/plugin-git-client.yml

@@ -8,7 +8,6 @@ paths:
   - "org/jenkinsci/plugins/git-client"
 developers:
   - "markewaite"
-  - "mramonleon"
   - "olamy"
   - "rsandell"
 security:

permissions/plugin-git.yml

@@ -9,7 +9,6 @@ paths:
   - "org/jvnet/hudson/plugins/git"
 developers:
   - "markewaite"
-  - "mramonleon"
   - "olamy"
   - "rsandell"
 security: