build(deps): Bump github.com/spiffe/go-spiffe/v2 in /authbridge/authlib

Bumps [github.com/spiffe/go-spiffe/v2](https://github.com/spiffe/go-spiffe) from 2.6.0 to 2.8.1.
- [Release notes](https://github.com/spiffe/go-spiffe/releases)
- [Changelog](https://github.com/spiffe/go-spiffe/blob/main/CHANGELOG.md)
- [Commits](spiffe/go-spiffe@v2.6.0...v2.8.1)

---
updated-dependencies:
- dependency-name: github.com/spiffe/go-spiffe/v2
  dependency-version: 2.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

authbridge/authlib/go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/lestrrat-go/jwx/v2 v2.1.6
 	github.com/maximhq/bifrost/core v1.7.0
 	github.com/open-policy-agent/opa v1.4.2
-	github.com/spiffe/go-spiffe/v2 v2.6.0
+	github.com/spiffe/go-spiffe/v2 v2.8.1
 	golang.org/x/net v0.56.0
 	golang.org/x/sys v0.46.0
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171

authbridge/authlib/go.sum

@@ -209,8 +209,8 @@ github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ
 github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/spf13/cast v1.10.0 h1:h2x0u2shc1QuLHfxi+cTJvs30+ZAHOGRic8uyGTDWxY=
 github.com/spf13/cast v1.10.0/go.mod h1:jNfB8QC9IA6ZuY2ZjDp0KtFO2LZZlg4S/7bzP6qqeHo=
-github.com/spiffe/go-spiffe/v2 v2.6.0 h1:l+DolpxNWYgruGQVV0xsfeya3CsC7m8iBzDnMpsbLuo=
-github.com/spiffe/go-spiffe/v2 v2.6.0/go.mod h1:gm2SeUoMZEtpnzPNs2Csc0D/gX33k1xIx7lEzqblHEs=
+github.com/spiffe/go-spiffe/v2 v2.8.1 h1:eXZMLsu+3MLEPJyGJkolqtVrteZfQdUpOWj6LTiDl/E=
+github.com/spiffe/go-spiffe/v2 v2.8.1/go.mod h1:47Q0Q9/AqGha8QLHp+kxpH4Wca7X7EnOtlIJy3mxZ3U=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=