[UPMERGE] 1.14 -> 1.15

[SyliusBot]

This PR has been generated automatically.
For more details see upmerge_pr.yaml.

Remember! The upmerge should always be merged with using Merge pull request button.

In case of conflicts, please resolve them manually with usign the following commands:

git fetch upstream
gh pr checkout <this-pr-number>
git merge upstream/1.15 -m "Resolve conflicts between 1.14 and 1.15"

If you use other name for the upstream remote, please replace upstream with the name of your remote pointing to the Sylius/SyliusGridBundle repository.

Once the conflicts are resolved, please run git merge --continue and push the changes to this PR.