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)	==4.1.5 -> ==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)

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Coverage report

Total coverage

Status	Category	Percentage	Covered / Total
🔴	Statements	12%	84/700
🔴	Branches	13.69%	49/358
🔴	Functions	9.62%	25/260
🔴	Lines	23.23%	528/2273

Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

Report generated by 🧪jest coverage report action from cfb71b3