chore(deps): Bump github.com/sigstore/sigstore from 1.8.11 to 1.8.12 (#1760)

Bumps [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore) from 1.8.11 to 1.8.12.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.8.11...v1.8.12)

---
updated-dependencies:
- dependency-name: github.com/sigstore/sigstore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -28,7 +28,7 @@ require (
 	github.com/ryanuber/go-glob v1.0.0
 	github.com/sigstore/cosign/v2 v2.4.1
 	github.com/sigstore/rekor v1.3.7
-	github.com/sigstore/sigstore v1.8.11
+	github.com/sigstore/sigstore v1.8.12
 	github.com/stretchr/testify v1.10.0
 	github.com/theupdateframework/go-tuf v0.7.0
 	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399

go.sum

@@ -260,8 +260,8 @@ github.com/containerd/log v0.1.0 h1:TCJt7ioM2cr/tfR8GPbGf9/VRAX8D2B4PjzCpfX540I=
 github.com/containerd/log v0.1.0/go.mod h1:VRRf09a7mHDIRezVKTRCrOq78v577GXq3bSa3EhrzVo=
 github.com/containerd/stargz-snapshotter/estargz v0.14.3 h1:OqlDCK3ZVUO6C3B/5FSkDwbkEETK84kQgEeFwDC+62k=
 github.com/containerd/stargz-snapshotter/estargz v0.14.3/go.mod h1:KY//uOCIkSuNAHhJogcZtrNHdKrA99/FCCRjE3HD36o=
-github.com/coreos/go-oidc/v3 v3.11.0 h1:Ia3MxdwpSw702YW0xgfmP1GVCMA9aEFWu12XUZ3/OtI=
-github.com/coreos/go-oidc/v3 v3.11.0/go.mod h1:gE3LgjOgFoHi9a4ce4/tJczr0Ai2/BoDhf0r5lltWI0=
+github.com/coreos/go-oidc/v3 v3.12.0 h1:sJk+8G2qq94rDI6ehZ71Bol3oUHy63qNYmkiSjrc/Jo=
+github.com/coreos/go-oidc/v3 v3.12.0/go.mod h1:gE3LgjOgFoHi9a4ce4/tJczr0Ai2/BoDhf0r5lltWI0=
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/cyberphone/json-canonicalization v0.0.0-20231011164504-785e29786b46 h1:2Dx4IHfC1yHWI12AxQDJM1QbRCDfk6M+blLzlZCXdrc=
 github.com/cyberphone/json-canonicalization v0.0.0-20231011164504-785e29786b46/go.mod h1:uzvlm1mxhHkdfqitSA92i7Se+S9ksOn3a3qmv/kyOCw=
@@ -757,8 +757,8 @@ github.com/sigstore/rekor v1.3.7 h1:Z5UW5TmqbTZnyOFkMRfi32q/CWcxK6VuzIkx+33mbq8=
 github.com/sigstore/rekor v1.3.7/go.mod h1:TihqJscZ6L6398x68EHY82t0AOnGYfrQ0siXe3WgbR4=
 github.com/sigstore/scaffolding v0.7.18 h1:0Uko31b+BHSfoh2v0k61V3H7KwAvOA2gffda3mKfTGk=
 github.com/sigstore/scaffolding v0.7.18/go.mod h1:uvV0f2ky//WDhCkOLm3McxuxbUmDG+UwsmylPWdYOB8=
-github.com/sigstore/sigstore v1.8.11 h1:tEqeQqbT+awtM87ec9KEeSUxT/AFvJNawneYJyAkFrQ=
-github.com/sigstore/sigstore v1.8.11/go.mod h1:fdrFQosxCQ4wTL5H1NrZcQkqQ72AQbPjtpcL2QOGKV0=
+github.com/sigstore/sigstore v1.8.12 h1:S8xMVZbE2z9ZBuQUEG737pxdLjnbOIcFi5v9UFfkJFc=
+github.com/sigstore/sigstore v1.8.12/go.mod h1:+PYQAa8rfw0QdPpBcT+Gl3egKD9c+TUgAlF12H3Nmjo=
 github.com/sigstore/sigstore-go v0.6.2 h1:8uiywjt73vzfrGfWYVwVsiB1E1Qmwmpgr1kVpl4fs6A=
 github.com/sigstore/sigstore-go v0.6.2/go.mod h1:pOIUH7Jx+ctwMICo+2zNrViOJJN5sGaQgwX4yAVJkA0=
 github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.12 h1:EC3UmIaa7nV9sCgSpVevmvgvTYTkMqyrRbj5ojPp7tE=