pre-commit template missing `dependabot.yml`

[ukmo-ccbunney]

The pre-commit configuration template does not check the .github/.dependabot.yml file.

This became apparent when the zizmor hook did not pick up a missing cooldown period in the .dependabot.yml file for Iris, but it does flag a warning when zizmor is run independently via the command line.

It aught to be throwing this warning when run against the Iris repo:

warning[dependabot-cooldown]: insufficient cooldown in Dependabot updates
 --> .github/dependabot.yml:8:5
  |
8 |   - package-ecosystem: "github-actions"
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing cooldown configuration
  |

See https://docs.zizmor.sh/audits/#dependabot-cooldown

This is due to an overly restrictive set of file filters at the top of the .pre-commit-config.yml:

.github/templates/.pre-commit-config.yaml

Lines 13 to 24 in 575c890

	# Alphabetised, for lack of a better order.
	files: |
	(?x)(
	.github\/workflows\/.*|
	benchmarks\/.+\.py|
	docs\/.+\.py|
	lib\/.+\.py|
	noxfile\.py|
	pyproject\.toml|
	setup\.py|
	src\/.+\.py
	)

We could either:

• relax the glob at line 16 to .github/*
• explicitly add .github/dependabot.yml