Update dependency shfmt to v3.13.1

renovate[bot] · web-flow · commit c7aa4564fbce · 2026-04-15T12:52:58.000Z
diff --git a/.tool-versions b/.tool-versions
@@ -1,2 +1,2 @@
 shellcheck 0.9.0
-shfmt 3.8.0
+shfmt 3.13.1
