build: Update module github.com/go-git/go-git/v6 to v6.0.0-alpha.4

Signed-off-by: go-git-renovate[bot] <245267575+go-git-renovate[bot]@users.noreply.github.com>

Author: go-git-renovate[bot]

go.mod

@@ -7,7 +7,7 @@ toolchain go1.25.10
 require (
 	github.com/go-git/go-billy/v6 v6.0.0-alpha.1
 	github.com/go-git/go-git-fixtures/v6 v6.0.0-alpha.1
-	github.com/go-git/go-git/v6 v6.0.0-alpha.3.0.20260512141313-533ba09d9588
+	github.com/go-git/go-git/v6 v6.0.0-alpha.4
 	github.com/spf13/cobra v1.10.2
 	golang.org/x/crypto v0.52.0
 	golang.org/x/term v0.43.0

go.sum

@@ -22,8 +22,8 @@ github.com/go-git/go-billy/v6 v6.0.0-alpha.1 h1:xVjAR4oUvrKy7/Xuw/lLlV3gkxR3KO2H
 github.com/go-git/go-billy/v6 v6.0.0-alpha.1/go.mod h1:eaCUpHbedW7//EwcYmUDfJe2N6sJC9O12AT0OTqJR1E=
 github.com/go-git/go-git-fixtures/v6 v6.0.0-alpha.1 h1:gmqi2jvsreu0s8JMLylYDFq4sbjHwwlhktMw0DUg3mA=
 github.com/go-git/go-git-fixtures/v6 v6.0.0-alpha.1/go.mod h1:ECf1MqJlBdYpKggBrOXjo/0EnvRZx6D++I86UYjPgAQ=
-github.com/go-git/go-git/v6 v6.0.0-alpha.3.0.20260512141313-533ba09d9588 h1:TgVntrlBTW1A2HAoPljPLhP8rxmLzI4mUPv2Aq7r4KQ=
-github.com/go-git/go-git/v6 v6.0.0-alpha.3.0.20260512141313-533ba09d9588/go.mod h1:4ODa/G7hPWrh4Y+7lmt59Ij3zW38IEfvRoAZxLYYBhc=
+github.com/go-git/go-git/v6 v6.0.0-alpha.4 h1:aDTc2UGanmaE7FkGLSlBEB9nohMnQ+RKXcfq/D+esDQ=
+github.com/go-git/go-git/v6 v6.0.0-alpha.4/go.mod h1:4ODa/G7hPWrh4Y+7lmt59Ij3zW38IEfvRoAZxLYYBhc=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/kevinburke/ssh_config v1.6.0 h1:J1FBfmuVosPHf5GRdltRLhPJtJpTlMdKTBjRgTaQBFY=