Update stryker-js monorepo to v8

Author: renovate[bot]

package.json

@@ -7,9 +7,9 @@
   "author": "Daniel Nixon <[email protected]>",
   "license": "MIT",
   "devDependencies": {
-    "@stryker-mutator/core": "7.3.0",
-    "@stryker-mutator/jest-runner": "7.3.0",
-    "@stryker-mutator/typescript-checker": "7.3.0",
+    "@stryker-mutator/core": "8.6.0",
+    "@stryker-mutator/jest-runner": "8.6.0",
+    "@stryker-mutator/typescript-checker": "8.6.0",
     "@types/eslint": "8.56.11",
     "@types/jest": "29.5.12",
     "codecov": "3.8.3",