chore(deps): update dependency git-fixtures to v8

Author: renovate[bot]

package.json

@@ -37,7 +37,7 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prefer-let": "^3.0.1",
     "fs-extra": "^11.0.0",
-    "git-fixtures": "^4.0.0",
+    "git-fixtures": "^8.0.0",
     "mocha": "^10.2.0",
     "mocha-helpers": "^8.0.0",
     "monorepo-next": "^10.0.0",