Bump @actions/core from 1.2.6 to 1.9.1 in /ci/perf-tester (#209)

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.2.6 to 1.9.1.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/core/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/core)

---
updated-dependencies:
- dependency-name: "@actions/core"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

ci/perf-tester/package-lock.json

@@ -2,7 +2,7 @@
   "private": true,
   "main": "src/index.js",
   "devDependencies": {
-    "@actions/core": "^1.2.6",
+    "@actions/core": "^1.9.1",
     "@actions/exec": "^1.0.3",
     "@actions/github": "^2.0.1"
   }