build: Update go-git

Author: go-git-renovate[bot]

go.mod

@@ -5,8 +5,8 @@ go 1.25.0
 toolchain go1.25.4
 
 require (
-	github.com/go-git/go-billy/v6 v6.0.0-20260226131633-45bd0956d66f
-	github.com/go-git/go-git-fixtures/v5 v5.1.2-0.20260328065819-eda62fa02f83
+	github.com/go-git/go-billy/v6 v6.0.0-20260328065524-593ae452e14d
+	github.com/go-git/go-git-fixtures/v5 487c094a2af5
 	github.com/go-git/go-git/v6 v6.0.0-20260114124804-a8db3a6585a6
 	github.com/spf13/cobra v1.10.2
 	golang.org/x/crypto v0.49.0