Bump wysiwyg from 0.17.0 to 0.18.0

Bumps [wysiwyg](https://github.com/matrix-org/matrix-wysiwyg) from 0.17.0 to 0.18.0.
- [Release notes](https://github.com/matrix-org/matrix-wysiwyg/releases)
- [Changelog](https://github.com/matrix-org/matrix-rich-text-editor/blob/main/CHANGELOG.md)
- [Commits](matrix-org/matrix-rich-text-editor@0.17.0...0.18.0)

---
updated-dependencies:
- dependency-name: io.element.android:wysiwyg
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

dependencies.gradle

@@ -103,7 +103,7 @@ ext.libs = [
         ],
         element     : [
                 'opusencoder'             : "io.element.android:opusencoder:1.1.0",
-                'wysiwyg'                 : "io.element.android:wysiwyg:0.17.0"
+                'wysiwyg'                 : "io.element.android:wysiwyg:0.18.0"
         ],
         squareup    : [
                 'moshi'                  : "com.squareup.moshi:moshi:$moshi",