chore(deps): update dependency flutter to v3.38.3 (#958)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

renovate.Dockerfile

@@ -7,4 +7,4 @@
 FROM scratch
 
 # renovate: datasource=flutter-version depName=flutter
-ENV FLUTTER_VERSION=3.38.2
+ENV FLUTTER_VERSION=3.38.3