[TASK] Mark properties as private in AdminModuleController

[brotkrueml]

As the class is defined as final, it does not make sense to set the properties as protected as this class cannot be extended.

Releases: main, 12.4

[github-actions]

The backport to 12.4 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply ca299c4... [TASK] Mark properties as private in AdminModuleController
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config advice.mergeConflict false"

stdout

Auto-merging Classes/Controller/AdminModuleController.php
CONFLICT (content): Merge conflict in Classes/Controller/AdminModuleController.php

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-12.4 12.4
# Navigate to the new working tree
cd .worktrees/backport-12.4
# Create a new branch
git switch --create backport-283-to-12.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick ca299c47b1646516e481cb9d0a96a5d3fb58bb93
# Push it to GitHub
git push --set-upstream origin backport-283-to-12.4
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-12.4

Then, create a pull request where the base branch is 12.4 and the compare/head branch is backport-283-to-12.4.

[froemken]

Backport problem will be solved with PR: #284