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 6.0.0-20260328065524-593ae452e14d 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: direct:production
...

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

Author: dependabot[bot]

go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/fullstorydev/grpchan v1.1.2
 	github.com/go-chi/chi/v5 v5.3.0
 	github.com/go-chi/cors v1.2.2
-	github.com/go-git/go-billy/v6 v6.0.0-20260328065524-593ae452e14d
+	github.com/go-git/go-billy/v6 v6.0.0-alpha.1
 	github.com/go-git/go-git/v6 v6.0.0-alpha.2
 	github.com/go-jose/go-jose/v4 v4.1.4
 	github.com/go-openapi/jsonpointer v0.23.1
@@ -172,7 +172,6 @@ require (
 	github.com/containerd/platforms v1.0.0-rc.2 // indirect
 	github.com/cpuguy83/dockercfg v0.3.2 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
-	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/davidmz/go-pageant v1.0.2 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect

go.sum

@@ -227,8 +227,6 @@ github.com/cpuguy83/go-md2man/v2 v2.0.7/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6N
 github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
 github.com/creack/pty v1.1.24 h1:bJrF4RRfyJnbTJqzRLHzcGaZK1NeM5kTC9jGgovnR1s=
 github.com/creack/pty v1.1.24/go.mod h1:08sCNb52WyoAwi2QDyzUCTgcvVFhUzewun7wtTfvcwE=
-github.com/cyphar/filepath-securejoin v0.6.1 h1:5CeZ1jPXEiYt3+Z6zqprSAgSWiggmpVyciv8syjIpVE=
-github.com/cyphar/filepath-securejoin v0.6.1/go.mod h1:A8hd4EnAeyujCJRrICiOWqjS1AX0a9kM5XL+NwKoYSc=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
@@ -309,8 +307,8 @@ github.com/go-fed/httpsig v1.1.0 h1:9M+hb0jkEICD8/cAiNqEB66R87tTINszBRTjwjQzWcI=
 github.com/go-fed/httpsig v1.1.0/go.mod h1:RCMrTZvN1bJYtofsG4rd5NaO5obxQ5xBkdiS7xsT7bM=
 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/v6 v6.0.0-20260328065524-593ae452e14d h1:bLMI9z4mKkfQO383+O3fkP4xdWQcMdnn5fFBMwaBC1M=
-github.com/go-git/go-billy/v6 v6.0.0-20260328065524-593ae452e14d/go.mod h1:LLeMBFApkgIKwMzirxpU9XB7NvO2HdTw5FXmeP1M6c8=
+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/v6 v6.0.0-20260405195209-b16dd39735e0 h1:XoTsdvaghuVfIr7HpNTmFDLu2nz3I2iGqyn6Uk6MkJc=
 github.com/go-git/go-git-fixtures/v6 v6.0.0-20260405195209-b16dd39735e0/go.mod h1:1Lr7/vYEYyl6Ir9Ku0tKrCIRreM5zovv0Jdx2MPSM4s=
 github.com/go-git/go-git/v6 v6.0.0-alpha.2 h1:T3loNtDuAixNzXtlQxZhnYiYpaQ3CA4vn9RssAniEeI=