Update dependency flutter to v3.38.4 (#25)

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

Author: renovate[bot]

.fvmrc

@@ -1,4 +1,4 @@
 {
-  "flutter": "3.38.3",
+  "flutter": "3.38.4",
   "flavors": {}
 }