chore(deps): update docker/dockerfile docker tag to v1.9 (#39)

renovate[bot] · web-flow · commit 910f12956449 · 2024-07-15T09:30:52.000+02:00
Co-authored-by: renovate[bot] &lt;29139614+renovate[bot]@users.noreply.github.com&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.8
+# syntax=docker/dockerfile:1.9
 
 ARG PYTHON_VERSION=3.10
 
