Update dependency flutter to v3.38.4 (#210)

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

Author: renovate[bot]

.tool-versions

@@ -1,2 +1,2 @@
-flutter 3.38.3-stable
+flutter 3.38.4-stable
 java openjdk-21.0.2