Bump @actions/core from 1.2.3 to 1.2.6 (#29)

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.2.3 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] <support@github.com>

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

package.json

@@ -34,7 +34,7 @@
   },
   "homepage": "https://github.com/mr-smithers-excellent/docker-build-push-action#readme",
   "dependencies": {
-    "@actions/core": "^1.2.3",
+    "@actions/core": "^1.2.6",
     "@actions/github": "^2.1.1"
   },
   "devDependencies": {