automation: Update docker-matrix_riotweb Docker tag to v1.11.78

This MR contains the following updates:

Package	Update	Change
docker-matrix_riotweb	patch	v1.11.77 -> v1.11.78

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Release Notes

element-hq/element-web (docker-matrix_riotweb)

v1.11.78

Compare Source

✨ Features

• Add Release announcement for the pinning message list (#​46). Contributed by @​florianduros.
• Unlabs feature pinning (#​22). Contributed by @​florianduros.
• Add mobile registration (#​42). Contributed by @​langleyd.
• Add support for org.matrix.cross_signing_reset UIA stage flow (#​34). Contributed by @​t3chguy.
• Add timezone to user profile (#​20). Contributed by @​Half-Shot.
• Add config option to force verification (#​29). Contributed by @​dbkr.
• Reduce pinned message banner size (#​28). Contributed by @​florianduros.
• Enable message pinning labs by default (#​25). Contributed by @​florianduros.
• Remove release announcement of the new header (#​23). Contributed by @​florianduros.

🐛 Bug Fixes

• Fix timeout type (#​40). Contributed by @​dbkr.
• Fix huge usage bandwidth and performance issue of pinned message banner. (#​37). Contributed by @​florianduros.
• Reverse order of pinned message list (#​19). Contributed by @​florianduros.

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