Add eslint-plugin-regexp to devDependencies

As required by peerDependencies of @kevinoid/[email protected].

Fixes: 8b33e534ceea ("build(deps-dev): bump eslint-config-kevinoid from ^30.0.0 to ^31.0.0")
Signed-off-by: Kevin Locke <[email protected]>

Author: kevinoid

package.json

@@ -67,6 +67,7 @@
     "eslint-plugin-jsdoc": "^46.0.0",
     "eslint-plugin-n": "^16.0.0",
     "eslint-plugin-promise": "^6.0.0",
+    "eslint-plugin-regexp": "^1.0.0",
     "eslint-plugin-unicorn": "^48.0.1",
     "jsdoc": "^4.0.0",
     "mocha": "^10.0.0",
@@ -86,6 +87,7 @@
       "eslint-plugin-jsdoc",
       "eslint-plugin-n",
       "eslint-plugin-promise",
+      "eslint-plugin-regexp",
       "eslint-plugin-unicorn"
     ]
   },