build(deps): Bump github.com/notaryproject/notation-go

Bumps [github.com/notaryproject/notation-go](https://github.com/notaryproject/notation-go) from 1.2.0-beta.1.0.20250115061529-96b71337184c to 1.2.1.
- [Release notes](https://github.com/notaryproject/notation-go/releases)
- [Changelog](https://github.com/notaryproject/notation-go/blob/main/RELEASE_CHECKLIST.md)
- [Commits](https://github.com/notaryproject/notation-go/commits/v1.2.1)

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

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

test/e2e/plugin/go.mod

@@ -5,7 +5,7 @@ go 1.23
 require (
 	github.com/golang-jwt/jwt v3.2.2+incompatible
 	github.com/notaryproject/notation-core-go v1.2.0
-	github.com/notaryproject/notation-go v1.2.0-beta.1.0.20250115061529-96b71337184c
+	github.com/notaryproject/notation-go v1.2.1
 	github.com/notaryproject/notation-plugin-framework-go v1.0.0
 	github.com/spf13/cobra v1.8.1
 )

test/e2e/plugin/go.sum

@@ -40,8 +40,8 @@ github.com/jcmturner/rpc/v2 v2.0.3 h1:7FXXj8Ti1IaVFpSAziCZWNzbNuZmnvw/i6CqLNdWfZ
 github.com/jcmturner/rpc/v2 v2.0.3/go.mod h1:VUJYCIDm3PVOEHw8sgt091/20OJjskO/YJki3ELg/Hc=
 github.com/notaryproject/notation-core-go v1.2.0 h1:WElMG9X0YXJhBd0A4VOxLNalTLrTjvqtIAj7JHr5X08=
 github.com/notaryproject/notation-core-go v1.2.0/go.mod h1:+y3L1dOs2/ZwJIU5Imo7BBvZ/M3CFjXkydGGdK09EtA=
-github.com/notaryproject/notation-go v1.2.0-beta.1.0.20250115061529-96b71337184c h1:P9GOhlDUtUXEWGikUDDIrnES2YtlYa15tTfg1U/E96Y=
-github.com/notaryproject/notation-go v1.2.0-beta.1.0.20250115061529-96b71337184c/go.mod h1:ig6lhOPvLW4jrp6ZfaW+B3uNGKbcNW9pgIByvz/s31w=
+github.com/notaryproject/notation-go v1.2.1 h1:fbCMBcvg1xttrisd5CyM60QDectGYYF701Us0M3cKN8=
+github.com/notaryproject/notation-go v1.2.1/go.mod h1:re9V+TfuNRaUq5e3NuNcCJN53++sL2KbnJrjGyOUpgE=
 github.com/notaryproject/notation-plugin-framework-go v1.0.0 h1:6Qzr7DGXoCgXEQN+1gTZWuJAZvxh3p8Lryjn5FaLzi4=
 github.com/notaryproject/notation-plugin-framework-go v1.0.0/go.mod h1:RqWSrTOtEASCrGOEffq0n8pSg2KOgKYiWqFWczRSics=
 github.com/notaryproject/tspclient-go v1.0.0 h1:AwQ4x0gX8IHnyiZB1tggpn5NFqHpTEm1SDX8YNv4Dg4=