automation: Update matrix-elementweb Docker tag to v1.11.28

This MR contains the following updates:

Package	Update	Change
matrix-elementweb	patch	v1.11.26 -> v1.11.28

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Release Notes

vector-im/element-web

v1.11.28

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🐛 Bug Fixes

• (No changes, version bumped to sync with element-desktop.)

v1.11.27

Compare Source

🐛 Bug Fixes

• Fix detection of encryption for all users in a room (#​10487). Fixes #​24995.

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