Bump simple-git and lint-staged

Removes [simple-git](https://github.com/steveukx/git-js/tree/HEAD/simple-git). It's no longer used after updating ancestor dependency [lint-staged](https://github.com/okonet/lint-staged). These dependencies need to be updated together.


Removes `simple-git`

Updates `lint-staged` from 8.2.1 to 13.1.0
- [Release notes](https://github.com/okonet/lint-staged/releases)
- [Commits](https://github.com/okonet/lint-staged/compare/v8.2.1...v13.1.0)

---
updated-dependencies:
- dependency-name: simple-git
  dependency-type: indirect
- dependency-name: lint-staged
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "windycoys",
-  "version": "1.0.2",
+  "version": "1.0.1",
   "description": "Wordpress theme for windycoys.com",
   "author": "Dan Head <me@danielhead.com>",
   "license": "MIT",
@@ -47,7 +47,7 @@
     "imagemin-jpegtran": "^6.0.0",
     "imagemin-pngquant": "^7.0.0",
     "jest": "^26.1.0",
-    "lint-staged": "^8.2.1",
+    "lint-staged": "^13.1.0",
     "mysql": "^2.18.1",
     "nodemon": "^2.0.4",
     "npm-run-all": "^4.1.5",