Bump @actions/core from 1.2.4 to 1.2.6 (#15)

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

Author: dependabot[bot]

package-lock.json

@@ -26,7 +26,7 @@
   "author": "Jochen Schalanda",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.0.0",
+    "@actions/core": "^1.2.6",
     "@actions/exec": "^1.0.0",
     "@actions/http-client": "^1.0.8",
     "@actions/io": "^1.0.0",