clang-format: enforce line breaks after the template closer

[garrison]

IMO, this is more readable and consistent with Black style, but it requires clang-format 21, which is not yet available in a stable Fedora version. So I plan to hold off merging this for a bit.

[coveralls]

Pull Request Test Coverage Report for Build 17928437609

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.994%

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Totals
Change from base Build 17924720588:	0.0%
Covered Lines:	313
Relevant Lines:	333

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💛 - Coveralls