chore: bump hashicorp/random in /examples/runner-docker

Bumps [hashicorp/random](https://github.com/hashicorp/terraform-provider-random) from 3.4.3 to 3.5.1.
- [Release notes](https://github.com/hashicorp/terraform-provider-random/releases)
- [Changelog](https://github.com/hashicorp/terraform-provider-random/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-provider-random@v3.4.3...v3.5.1)

---
updated-dependencies:
- dependency-name: hashicorp/random
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/runner-docker/.terraform.lock.hcl

@@ -20,7 +20,7 @@ terraform {
     }
     random = {
       source  = "hashicorp/random"
-      version = "3.4.3"
+      version = "3.5.1"
     }
   }
 }