Bump fluentd image to 1.12.0-sumo-4

[pmalek-sumo]

Description

Use https://github.com/SumoLogic/sumologic-kubernetes-fluentd/releases/tag/v1.12.0-sumo-4

[sumo-backporter]

The backport to release-v2.0 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-release-v2.0 release-v2.0
# Navigate to the new working tree
cd .worktrees/backport-release-v2.0
# Create a new branch
git switch --create backport-1510-to-release-v2.0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick ---mainline 1 78124e487e2cec45a8546e7f4072c3568b269ccf
# Push it to GitHub
git push --set-upstream origin backport-1510-to-release-v2.0
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release-v2.0

Then, create a pull request where the base branch is release-v2.0 and the compare/head branch is backport-1510-to-release-v2.0.

[perk-sumo]

I backported this by hand: #1511