build(deps): bump ruma-common from 0.15.3 to 0.15.4

Bumps [ruma-common](https://github.com/ruma/ruma) from 0.15.3 to 0.15.4.
- [Release notes](https://github.com/ruma/ruma/releases)
- [Commits](ruma/ruma@ruma-common-0.15.3...ruma-common-0.15.4)

---
updated-dependencies:
- dependency-name: ruma-common
  dependency-version: 0.15.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -512,7 +512,7 @@ version = "2.1.1"
 
 # Matrix-related types
 [workspace.dependencies.ruma-common]
-version = "0.15.3"
+version = "0.15.4"
 
 # TLS stack
 [workspace.dependencies.rustls]