Bump azure-pipelines-task-lib in /vsts-variable-set/v3

Bumps [azure-pipelines-task-lib](https://github.com/Microsoft/azure-pipelines-task-lib) from 4.2.0 to 4.3.1.
- [Release notes](https://github.com/Microsoft/azure-pipelines-task-lib/releases)
- [Commits](https://github.com/Microsoft/azure-pipelines-task-lib/commits)

---
updated-dependencies:
- dependency-name: azure-pipelines-task-lib
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

vsts-variable-set/v3/package-lock.json

@@ -7,7 +7,7 @@
     "email": "jesse.houwing@gmail.com"
   },
   "dependencies": {
-    "azure-pipelines-task-lib": "^4.2.0"
+    "azure-pipelines-task-lib": "^4.3.1"
   },
   "scripts": {
     "initdev:npm": "npm install",