Use fixed strings when searching for plugin manager version

[timja]

b95fd98
Found a blog post url with a date because of regex matching

Testing done

tested locally, before:

❯ grep -ilr 2.13.0 ./
.//alpine/hotspot/Dockerfile
.//debian/bookworm-slim/hotspot/Dockerfile
.//debian/bookworm/hotspot/Dockerfile
.//rhel/ubi9/hotspot/Dockerfile
.//docker-bake.hcl
.//README.md
.//windows/windowsservercore/hotspot/Dockerfile

after:

❯ grep -ilrF 2.13.0 ./
.//alpine/hotspot/Dockerfile
.//debian/bookworm-slim/hotspot/Dockerfile
.//debian/bookworm/hotspot/Dockerfile
.//rhel/ubi9/hotspot/Dockerfile
.//docker-bake.hcl
.//windows/windowsservercore/hotspot/Dockerfile

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue