chore: update dependency dart to v3.8.1

renovate[bot] · web-flow · commit 194210e3a536 · 2025-05-28T15:11:49.000Z
diff --git a/.tool-versions b/.tool-versions
@@ -1,2 +1,2 @@
-dart 3.4.4
+dart 3.8.1
 flutter 3.22.2-stable
