Bump selfsigned from 2.0.1 to 2.1.1 (#6193)

Bumps [selfsigned](https://github.com/jfromaniello/selfsigned) from 2.0.1 to 2.1.1.
- [Release notes](https://github.com/jfromaniello/selfsigned/releases)
- [Commits](https://github.com/jfromaniello/selfsigned/compare/v2.0.1...v2.1.1)

---
updated-dependencies:
- dependency-name: selfsigned
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

package.json

@@ -277,7 +277,7 @@
     "request": "^2.88.2",
     "request-promise-native": "^1.0.9",
     "rfc6902": "^4.0.2",
-    "selfsigned": "^2.0.1",
+    "selfsigned": "^2.1.1",
     "semver": "^7.3.7",
     "shell-env": "^3.0.1",
     "spdy": "^4.0.2",