fix(deps): update dotenv and @sentry/browser to resolve security vulnerabilities

- dotenv: ^6.2.0 → ^16.6.1 (CVE fixes)
- @sentry/browser: ^6.3.6 → ^7.120.4 (prototype pollution fix)

package.json

@@ -28,7 +28,7 @@
     "@primer/css": "^20.4.3",
     "@primer/octicons-react": "^17.4.1",
     "@primer/react": "^35.8.0",
-    "@sentry/browser": "^6.3.6",
+    "@sentry/browser": "^7.120.4",
     "ini": "^3.0.0",
     "js-base64": "^3.7.2",
     "nprogress": "^0.2.0",
@@ -67,7 +67,7 @@
     "clean-webpack-plugin": "^4.0.0",
     "copy-webpack-plugin": "^13.0.1",
     "css-loader": "^7.1.2",
-    "dotenv": "^6.2.0",
+    "dotenv": "^16.6.1",
     "dotenv-webpack": "^8.1.0",
     "eslint": "^9.39.0",
     "eslint-config-prettier": "^10.1.0",