chore(deps): update dependency wagtail to v4.1.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
wagtail (source, changelog)	==4.1.4 -> ==4.1.6

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Release Notes

wagtail/wagtail

v4.1.6: 4.1.6

Compare Source

• Fix: Rectify previous fix for TableBlock becoming uneditable after save (Sage Abdullah)
• Fix: Ensure that copying page correctly picks up the latest revision (Matt Westcott)
• Fix: Adjust collection field alignment in multi-upload forms (LB (Ben) Johnston)
• Fix: Prevent lowercase conversions of IndexView column headers (Virag Jain)
• Docs: Update documentation for log_action parameter on RevisionMixin.save_revision (Christer Jensen)

v4.1.5: 4.1.5

Compare Source

• Fix: Prevent TableBlock from becoming uneditable after save (Sage Abdullah)

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