Bump @actions/core from 1.1.1 to 1.2.6 (#25)

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.1.1 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

@@ -20,7 +20,7 @@
   "author": "YourNameOrOrganization",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.0.0",
+    "@actions/core": "^1.2.6",
     "shelljs": "^0.8.3"
   },
   "devDependencies": {

yarn.lock

@@ -2,10 +2,10 @@
 # yarn lockfile v1
 
 
-"@actions/core@^1.0.0":
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/@actions/core/-/core-1.1.1.tgz#e08f3dbfe04721bb3d040f8fca2d6d7e1817b2e1"
-  integrity sha512-O5G6EmlzTVsng7VSpNtszIoQq6kOgMGNTFB/hmwKNNA4V71JyxImCIrL27vVHCt2Cb3ImkaCr6o27C2MV9Ylwg==
+"@actions/core@^1.2.6":
+  version "1.2.6"
+  resolved "https://registry.yarnpkg.com/@actions/core/-/core-1.2.6.tgz#a78d49f41a4def18e88ce47c2cac615d5694bf09"
+  integrity sha512-ZQYitnqiyBc3D+k7LsgSBmMDVkOVidaagDG7j3fOym77jNunWRuYx7VSHa9GNfFZh+zh61xsCjRj4JxMZlDqTA==
 
 "@babel/code-frame@^7.0.0", "@babel/code-frame@^7.5.5":
   version "7.5.5"