chore(deps): update dependency matrix-org/mjolnir to v1.9.1

[renovate]

This PR contains the following updates:

Package	Update	Change
matrix-org/mjolnir	patch	1.9.0 -> 1.9.1

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Pre-merge checks

• The Release Notes do not describe any breaking changes.

• The Node version is the same as the one in the Mjolnir Dockerfile.

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Release Notes

matrix-org/mjolnir (matrix-org/mjolnir)

v1.9.1

Compare Source

Security Advisory

A security issue was discovered in the mention forwarding feature. We've backed it out in v1.9.1 (this release) and encourage admins to immediately upgrade to this version while we take a closer look.

What's Changed

• Revert "forward mentions to management room" feature by @​turt2live in https://github.com/matrix-org/mjolnir/pull/565

Full Changelog: matrix-org/mjolnir@v1.9.0...v1.9.1

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