OGRSpatialReference::GetAxesCount(): fix on CompoundCRS of BoundCRS

[rouault]

No description provided.

[github-actions]

The backport to release/3.3 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/3.3 release/3.3
# Navigate to the new working tree
cd .worktrees/backport-release/3.3
# Create a new branch
git switch --create backport-4432-to-release/3.3
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 25697464241fc4e108c959078e392589f02d9456
# Push it to GitHub
git push --set-upstream origin backport-4432-to-release/3.3
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release/3.3

Then, create a pull request where the base branch is release/3.3 and the compare/head branch is backport-4432-to-release/3.3.