Shorten dependency group name by Dependabot

"development-dependencies" seems a bit too long in a PR title.
Shorter titles with "dev-deps" are more readable and still clear. 

E.g.,

```diff
-Bump prettier from 3.5.3 to 3.6.0 in the development-dependencies group
+Bump prettier from 3.5.3 to 3.6.0 in the dev-deps group
```

Author: ybiquitous

.github/dependabot.yml

@@ -9,7 +9,7 @@ updates:
     labels:
       - 'pr: dependencies'
     groups:
-      development-dependencies:
+      dev-deps:
         dependency-type: 'development'
         exclude-patterns: ['eslint', 'eslint-*']