deps: bump @types/jest from 26.0.10 to 26.0.12 (#469)

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 26.0.10 to 26.0.12.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

Signed-off-by: dependabot[bot] <support@github.com>

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

package.json

@@ -61,7 +61,7 @@
     "@actions/io": "^1.0.2"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.10",
+    "@types/jest": "^26.0.12",
     "@types/js-yaml": "^3.12.4",
     "@types/node": "~12",
     "@typescript-eslint/eslint-plugin": "^2.34.0",