[Security] Bump @actions/core from 1.2.0 to 1.2.6 (softprops#68)

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.2.0 to 1.2.6. **This update includes a security fix.**
- [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-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -20,7 +20,7 @@
   "author": "softprops",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.2.0",
+    "@actions/core": "^1.2.6",
     "@actions/github": "^2.0.0",
     "@octokit/plugin-retry": "^3.0.2",
     "@octokit/plugin-throttling": "^3.2.1",