Bump cygwin/cygwin-install-action from 4 to 6

[dependabot]

Bumps cygwin/cygwin-install-action from 4 to 6.

Release notes

Sourced from cygwin/cygwin-install-action's releases.

v6

What's Changed

• Add warning about using SHELLOPTS to set igncr by @​tobil4sk in cygwin/cygwin-install-action#22
• Add work-vol option by @​gstrauss in cygwin/cygwin-install-action#27
• For performance, default work-vol to D: (if it exists) by @​gstrauss in cygwin/cygwin-install-action#27
• Add a retry mechanism for fetching setup executable by @​jon-turney in cygwin/cygwin-install-action#26
• Check Authenticode signature on setup execitable by @​jon-turney
• Give the action some outputs (e.g. so uses can find out where we installed) by @​jon-turney

New Contributors

• @​tobil4sk made their first contribution in cygwin/cygwin-install-action#22

Full Changelog: cygwin/cygwin-install-action@v5...v6

v5

What's Changed

• Drop the -g/--upgrade-also from the options used to invoke setup
• Use action/checkout v4 instead of v2 in tests by @​mlocati in cygwin/cygwin-install-action#16
• Add allow-test-packages option by @​gstrauss in cygwin/cygwin-install-action#12
• Check hash of downloaded setup by @​mlocati in cygwin/cygwin-install-action#17

New Contributors

• @​mlocati made their first contribution in cygwin/cygwin-install-action#16
• @​gstrauss made their first contribution in cygwin/cygwin-install-action#12

Full Changelog: cygwin/cygwin-install-action@v4...v5

Commits

• f200932 Give the action some outputs
• 52b4c10 Check Authenticode signature on setup
• e67b1f4 Factor out download retry as a function, to use on sha512.sum file also
• 8381d6d Add a retry mechanism for fetching setup executable
• 354b337 Consistently use throw to terminate with an error
• f623c57 Add a test of work-vol option
• d3a7464 Use D: drive as default work-vol
• 1c9eb7c Add work-vol option to target different setup volume
• d6a07e1 Tweak wording about SHELLOPTS and line-endings
• 63d1e75 Add warning about using SHELLOPTS to set igncr
• Additional commits viewable in compare view

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Summary by Sourcery

Bump cygwin-install-action from v4 to v6 to incorporate improved reliability, configurability, and security for Cygwin setup in workflows.

New Features:

• Validate checksum and Authenticode signature of the downloaded setup executable
• Add retry mechanism for fetching the setup executable and checksum file
• Expose installation directory and other outputs from the action
• Introduce work-vol option with fallback to D: drive for improved performance
• Warn users about using SHELLOPTS for igncr to avoid line-ending issues

[sourcery-ai]

Reviewer's Guide

This PR updates the GitHub Actions workflow to use version 6 of the Cygwin install action instead of v4, thereby pulling in all upstream fixes and enhancements without any changes to our own workflow logic.

File-Level Changes

Change	Details	Files
Upgrade Cygwin install action to v6	Replace cygwin/cygwin-install-action@v4 with @v6 in the workflow file	.github/workflows/cygwin.yml

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[Laguna1989]

@dependabot recreate