chore(deps): update joshuakgoldberg/octoguide action to v0.26.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
JoshuaKGoldberg/octoguide	action	patch	0.26.2 → 0.26.3	0.26.6 (+2)

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Release Notes

JoshuaKGoldberg/octoguide (JoshuaKGoldberg/octoguide)

v0.26.3

Compare Source

Bug Fixes

• add missing space in pr-automation-detected explanation (#​697) (01d9305), closes #​696

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