Add support for php 8.4

[R0Wi]

• Add 8.4
• Focus on 8.3 as recommended version
• Remove 8.1 from pipelines

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[R0Wi]

The backport to stable31 failed:

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

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-stable31 stable31
# Navigate to the new working tree
cd .worktrees/backport-stable31
# Create a new branch
git switch --create backport-298-to-stable31
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick ---mainline 1 1e40b60e8fa97dce1b64a7996caf88f225f99bcf
# Push it to GitHub
git push --set-upstream origin backport-298-to-stable31
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-stable31

Then, create a pull request where the base branch is stable31 and the compare/head branch is backport-298-to-stable31.