Update cygwin/cygwin-install-action action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cygwin/cygwin-install-action	action	major	v5 -> v6

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Release Notes

cygwin/cygwin-install-action (cygwin/cygwin-install-action)

v6

Compare Source

What's Changed

• Add warning about using SHELLOPTS to set igncr by @​tobil4sk in https://github.com/cygwin/cygwin-install-action/pull/22
• Add work-vol option by @​gstrauss in https://github.com/cygwin/cygwin-install-action/pull/27
• For performance, default work-vol to D: (if it exists) by @​gstrauss in https://github.com/cygwin/cygwin-install-action/pull/27
• Add a retry mechanism for fetching setup executable by @​jon-turney in https://github.com/cygwin/cygwin-install-action/pull/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 https://github.com/cygwin/cygwin-install-action/pull/22

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

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[straight-shoota]

This is just an infra update and should have no effect on users. So we can merge it directly for 1.17 despite the feature freeze.