Update docker.io/squidfunk/mkdocs-material Docker tag to v9.5.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/squidfunk/mkdocs-material	final	patch	9.5.14 -> 9.5.15

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Release Notes

squidfunk/mkdocs-material (docker.io/squidfunk/mkdocs-material)

v9.5.15: mkdocs-material-9.5.15

Compare Source

• Reverted fix for transparent iframes (9.5.14)
• Fixed #​6929: Interference of social plugin and auto dark mode
• Fixed #​6938: Giscus shows dark background in light mode (9.5.14 regression)

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