automation: Update matrix-elementweb Docker tag to v1.11.8

This MR contains the following updates:

Package	Update	Change
matrix-elementweb	patch	v1.11.6 -> v1.11.8

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Release Notes

vector-im/element-web

v1.11.8

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🐛 Bug Fixes

• Bump IDB crypto store version (#​2705).

v1.11.7

Compare Source

🔒 Security

• Fix for CVE-2022-39249
• Fix for CVE-2022-39250
• Fix for CVE-2022-39251
• Fix for CVE-2022-39236

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