Upgrade to TypeScript 6

tsconfig changes:

- Specify `moduleResolution: bundler` since we use a bundler
- Specify `types: ["node"]` to speed up build
- Remove `alwaysStrict` as this is now deprecated
- Specify `skipLibCheck: true` to speed up build
- Specify Octokit types.d.ts path manually to address compiler not being able to find types with `moduleResolution: bundler`

Author: henrymercer

package-lock.json

@@ -67,8 +67,8 @@
     "globals": "^17.4.0",
     "nock": "^14.0.11",
     "sinon": "^21.0.3",
-    "typescript": "^5.9.3",
-    "typescript-eslint": "^8.57.1"
+    "typescript": "^6.0.2",
+    "typescript-eslint": "^8.58.0"
   },
   "overrides": {
     "@actions/tool-cache": {