Update dependency shfmt to v3.9.0

renovate[bot] · web-flow · commit 9f0aa46bdf9b · 2024-08-17T14:51:08.000Z
diff --git a/.tool-versions b/.tool-versions
@@ -1,2 +1,2 @@
 shellcheck 0.9.0
-shfmt 3.8.0
+shfmt 3.9.0
