Bump fireflyiii/data-importer in /docker

Bumps fireflyiii/data-importer from version-2.2.0 to version-2.2.1.

---
updated-dependencies:
- dependency-name: fireflyiii/data-importer
  dependency-version: version-2.2.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docker/docker-compose.yml

@@ -360,7 +360,7 @@ services:
       start_period: 30s
 
   firefly_importer:
-    image: fireflyiii/data-importer:version-2.2.0
+    image: fireflyiii/data-importer:version-2.2.1
     container_name: firefly_importer
     hostname: firefly_importer
     restart: unless-stopped