Update dependency @actions/core to v2 (#80)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pr-review/package-lock.json

@@ -14,7 +14,7 @@
     "prettier:fix": "prettier --write ."
   },
   "dependencies": {
-    "@actions/core": "1.11.1",
+    "@actions/core": "2.0.1",
     "@actions/github": "6.0.1",
     "@octokit/action": "7.0.2",
     "@octokit/plugin-retry": "6.1.0",

pr-review/package.json

@@ -14,7 +14,7 @@
     "prettier:fix": "prettier --write ."
   },
   "dependencies": {
-    "@actions/core": "1.11.1",
+    "@actions/core": "2.0.1",
     "@actions/github": "6.0.1",
     "@octokit/plugin-retry": "6.1.0",
     "@octokit/plugin-throttling": "8.2.0",