automation: Update matrix-elementweb Docker tag to v1.11.20

This MR contains the following updates:

Package	Update	Change
matrix-elementweb	patch	v1.11.18 -> v1.11.20

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Release Notes

vector-im/element-web

v1.11.20

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🐛 Bug Fixes

• (Part 2) of prevent crash on older browsers (replace .at() with array.length-1)

v1.11.19

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🐛 Bug Fixes

• fix crash on browsers that don't support Array.at (#​9935). Contributed by @​andybalaam.

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