Apply Scientific Python repo-review suggestions

Apply those rules that make sense:
https://learn.scientific-python.org/development/guides/repo-review/?repo=jaraco%2Fskeleton&branch=main

Suggestions:

**[`GH102`](https://learn.scientific-python.org/development/guides/gha-basic#GH102): Auto-cancel on repeated PRs**
At least one workflow should auto-cancel.
```yaml
concurrency:
group: ${{ github.workflow }}-${{ github.ref }}
cancel-in-progress: true
```

**[PC100](https://learn.scientific-python.org/development/guides/style#PC100): Has pre-commit-hooks**
Must have `https://github.com/pre-commit/pre-commit-hooks` repo in `.pre-commit-config.yaml`

**[PC901](https://learn.scientific-python.org/development/guides/style#PC901): Custom pre-commit CI message**
Should have something like this in .pre-commit-config.yaml:
```yaml
ci:
autoupdate_commit_msg: 'chore: update pre-commit hooks'
```

**[RF101](https://learn.scientific-python.org/development/guides/style#RF101): Bugbear must be selected**
Must select the flake8-bugbear B checks. Recommended:
```yaml
[tool.ruff.lint]
extend-select = [
"B", # flake8-bugbear
]
```

**[RF102](https://learn.scientific-python.org/development/guides/style#RF102): isort must be selected**
Must select the isort I checks. Recommended:
```yaml
[tool.ruff.lint]
extend-select = [
"I", # isort
]
```

**[RF103](https://learn.scientific-python.org/development/guides/style#RF103): pyupgrade must be selected**
Must select the pyupgrade UP checks. Recommended:
```yaml
[tool.ruff.lint]
extend-select = [
"UP", # pyupgrade
]
```

Review the linked Scientific Python repo-review results, then inspect the GitHub workflow files, .pre-commit-config.yaml, and the repository's Ruff configuration. Apply the listed GH102, PC100, PC901, RF101, RF102, and RF103 recommendations where compatible, and verify the workflows and configured checks pass.

Written by the indexing model from the issue text.