Upgrade postgresql from 42.7.5 to 42.7.6

[sikeoka]

This PR is just a regular dependency upgrade.

[geoserver-bot]

The backport to 1.26.x failed:

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

stderr

error: could not apply e04cf4fc... Upgrade postgresql from 42.7.5 to 42.7.6
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 set advice.mergeConflict false"

stdout

Auto-merging geowebcache/pom.xml
CONFLICT (content): Merge conflict in geowebcache/pom.xml

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-1.26.x 1.26.x
# Navigate to the new working tree
cd .worktrees/backport-1.26.x
# Create a new branch
git switch --create backport-1408-to-1.26.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick e04cf4fcebcc176b696169a4fd2460a8cd4692b1
# Push it to GitHub
git push --set-upstream origin backport-1408-to-1.26.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.26.x

Then, create a pull request where the base branch is 1.26.x and the compare/head branch is backport-1408-to-1.26.x.