automation: Update matrix-elementweb Docker tag to v1.11.26

This MR contains the following updates:

Package	Update	Change
matrix-elementweb	patch	v1.11.25 -> v1.11.26

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Release Notes

vector-im/element-web

v1.11.26

Compare Source

🔒 Security

• Fixes for CVE-2023-28427 / GHSA-mwq8-fjpf-c2gr
• Fixes for CVE-2023-28103 / GHSA-6g43-88cp-w5gv

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