Bump @typescript-eslint/eslint-plugin from 8.50.0 to 8.51.0 (#209)

Bumps
[@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin)
from 8.50.0 to 8.51.0.

Remove duplicate @typescript-eslint plugin definition from eslint.config.js
as it's already included by eslint-config-love. Also remove legacy .eslintrc.js
file as the repository uses the flat config format (eslint.config.js) with ESLint 9.

Author: dependabot[bot]

.eslintrc.js

@@ -32,7 +32,6 @@ module.exports = tseslint.config(
             },
         },
         plugins: {
-            '@typescript-eslint': require('@typescript-eslint/eslint-plugin'),
             header: eslintPluginHeader,
             'no-null': eslintPluginNoNull,
             tsdoc: eslintPluginTsdoc,