chore(deps): update dependency tootsuite/mastodon to v4.3.8

| datasource      | package            | from  | to    |
| --------------- | ------------------ | ----- | ----- |
| github-releases | tootsuite/mastodon | 4.3.7 | 4.3.8 |

Dockerfile

@@ -68,7 +68,7 @@ RUN mkdir -p /app/code /app/pkg
 WORKDIR /app/code
 
 # renovate: datasource=github-releases depName=tootsuite/mastodon versioning=semver extractVersion=^v(?<version>.+)$
-ARG MASTODON_VERSION=4.3.7
+ARG MASTODON_VERSION=4.3.8
 
 ENV RAILS_ENV production
 ENV NODE_ENV production