Bump tslint from 6.1.1 to 6.1.2 (#2663)

Bumps [tslint](https://github.com/palantir/tslint) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@6.1.1...6.1.2)

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

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

Author: dependabot-preview[bot]

package-lock.json

@@ -64,7 +64,7 @@
     "mock-fs": "~4.12.0",
     "rewire": "~5.0.0",
     "sinon": "~9.0.2",
-    "tslint": "~6.1.1",
+    "tslint": "~6.1.2",
     "typescript": "~3.5.3",
     "vsce": "~1.75.0",
     "vscode-test": "~1.3.0"