Bump @actions/core from 1.2.2 to 1.2.6

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.2.2 to 1.2.6.
- [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)

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

Author: dependabot[bot]

package-lock.json

@@ -24,7 +24,7 @@
   "author": "Louis Brunner",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.2.2",
+    "@actions/core": "^1.2.6",
     "@actions/github": "^2.1.1",
     "diff": "^4.0.2"
   },