ci(pre-commit-autoupdate): set gpg private key

[cesarcoatl]

Summary by Sourcery

CI:

• Point the pre-commit autoupdate workflow's gpg-sign-private-key secret to COATL_BOT_GPG_PRIVATE_KEY instead of the passphrase secret.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the pre-commit autoupdate GitHub Actions workflow so the GPG signing step uses the correct private key secret instead of incorrectly reusing the passphrase secret.

File-Level Changes

Change	Details	Files
Fix GPG signing configuration in the pre-commit autoupdate workflow to reference the correct private key secret.	Change the gpg-sign-private-key secret mapping to use COATL_BOT_GPG_PRIVATE_KEY Keep existing gh-token and gpg-sign-passphrase secret mappings unchanged	.github/workflows/pre-commit-autoupdate.yml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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