chore(deps): bump github.com/go-git/go-billy/v6

Bumps [github.com/go-git/go-billy/v6](https://github.com/go-git/go-billy) from 6.0.0-20260424211911-732291493fb8 to 6.0.0-alpha.1.
- [Release notes](https://github.com/go-git/go-billy/releases)
- [Commits](https://github.com/go-git/go-billy/commits/v6.0.0-alpha.1)

---
updated-dependencies:
- dependency-name: github.com/go-git/go-billy/v6
  dependency-version: 6.0.0-alpha.1
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

go.mod

@@ -54,7 +54,7 @@ require (
 	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
 	github.com/go-git/gcfg/v2 v2.0.2 // indirect
 	github.com/go-git/go-billy/v5 v5.9.0 // indirect
-	github.com/go-git/go-billy/v6 v6.0.0-20260424211911-732291493fb8 // indirect
+	github.com/go-git/go-billy/v6 v6.0.0-alpha.1 // indirect
 	github.com/go-git/go-git/v5 v5.19.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-logr/zapr v1.3.0 // indirect

go.sum

@@ -124,8 +124,8 @@ github.com/go-git/gcfg/v2 v2.0.2 h1:MY5SIIfTGGEMhdA7d7JePuVVxtKL7Hp+ApGDJAJ7dpo=
 github.com/go-git/gcfg/v2 v2.0.2/go.mod h1:/lv2NsxvhepuMrldsFilrgct6pxzpGdSRC13ydTLSLs=
 github.com/go-git/go-billy/v5 v5.9.0 h1:jItGXszUDRtR/AlferWPTMN4j38BQ88XnXKbilmmBPA=
 github.com/go-git/go-billy/v5 v5.9.0/go.mod h1:jCnQMLj9eUgGU7+ludSTYoZL/GGmii14RxKFj7ROgHw=
-github.com/go-git/go-billy/v6 v6.0.0-20260424211911-732291493fb8 h1:QRpwB1ans3fB3Cmeuog1ATzvXg/xhqubqiQi97xNO6E=
-github.com/go-git/go-billy/v6 v6.0.0-20260424211911-732291493fb8/go.mod h1:CdBVp7CXl9l3sOyNEog46cP1Pvx/hjCe9AD0mtaIUYU=
+github.com/go-git/go-billy/v6 v6.0.0-alpha.1 h1:xVjAR4oUvrKy7/Xuw/lLlV3gkxR3KO2H8W+MamuVVsQ=
+github.com/go-git/go-billy/v6 v6.0.0-alpha.1/go.mod h1:eaCUpHbedW7//EwcYmUDfJe2N6sJC9O12AT0OTqJR1E=
 github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399 h1:eMje31YglSBqCdIqdhKBW8lokaMrL3uTkpGYlE2OOT4=
 github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399/go.mod h1:1OCfN199q1Jm3HZlxleg+Dw/mwps2Wbk9frAWm+4FII=
 github.com/go-git/go-git-fixtures/v6 v6.0.0-20260422085740-0c07409f52ec h1:FpCNUs50xfQyJJs31uO3mDnqU855OhzAzfkkTgE6/DI=