Update dependency go to v1.25.6

renovate[bot] · dominikholler · commit 2348a0922449 · 2026-01-15T21:34:17.000+01:00
diff --git a/go.mod b/go.mod
@@ -2,6 +2,6 @@ module github.com/dominikholler/webdavserver
 
 go 1.24.0
 
-toolchain go1.25.5
+toolchain go1.25.6
 
 require golang.org/x/net v0.49.0
