Add Rollup as explicit peer dependency in @mono-pub/configs

[coderabbitai]

The @mono-pub/configs package has Rollup plugins but doesn't declare Rollup itself as a dependency. To ensure proper version compatibility, we need to add rollup to peerDependencies in packages/configs/package.json with the compatible version range "^4.28.1".

Reference PR: #17
Reference comment: #17 (comment)
Requested by: @SavelevMatthew

[SavelevMatthew]

No longer needed, since mono-pub was migrated to tsup in thjs PR:
#25