Update vectorim/element-web Docker tag to v1.11.73

This MR contains the following updates:

Package	Type	Update	Change
vectorim/element-web		patch	v1.11.72 -> v1.11.73
vectorim/element-web	ironbank-docker	patch	v1.11.72 -> v1.11.73
vectorim/element-web	stage	patch	v1.11.72 -> v1.11.73

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Release Notes

element-hq/element-web (vectorim/element-web)

v1.11.73

Compare Source

Fixes for CVE-2024-42347 / GHSA-f83w-wqhc-cfp4.

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