chore(deps): bump @sentry/nextjs in /frontend/kesaseteli/employer

Bumps [@sentry/nextjs](https://github.com/getsentry/sentry-javascript) from 7.120.0 to 8.39.0.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/develop/CHANGELOG.md)
- [Commits](getsentry/sentry-javascript@7.120.0...8.39.0)

---
updated-dependencies:
- dependency-name: "@sentry/nextjs"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

frontend/kesaseteli/employer/package.json

@@ -21,7 +21,7 @@
     "@frontend/kesaseteli-shared": "*",
     "@frontend/shared": "*",
     "@sentry/browser": "^7.16.0",
-    "@sentry/nextjs": "^7.16.0",
+    "@sentry/nextjs": "^8.39.0",
     "axios": "^0.27.2",
     "dotenv": "^16.0.0",
     "hds-design-tokens": "^2.17.1",