build(deps): Bump the all group in /pkg/signature/kms/aws with 1 update

Bumps the all group in /pkg/signature/kms/aws with 1 update: [github.com/aws/aws-sdk-go](https://github.com/aws/aws-sdk-go).


Updates `github.com/aws/aws-sdk-go` from 1.49.16 to 1.49.21
- [Release notes](https://github.com/aws/aws-sdk-go/releases)
- [Commits](aws/aws-sdk-go@v1.49.16...v1.49.21)

---
updated-dependencies:
- dependency-name: github.com/aws/aws-sdk-go
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all
...

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

pkg/signature/kms/aws/go.mod

@@ -5,7 +5,7 @@ replace github.com/sigstore/sigstore => ../../../../
 go 1.20
 
 require (
-	github.com/aws/aws-sdk-go v1.49.16
+	github.com/aws/aws-sdk-go v1.49.21
 	github.com/aws/aws-sdk-go-v2 v1.24.1
 	github.com/aws/aws-sdk-go-v2/config v1.26.3
 	github.com/aws/aws-sdk-go-v2/service/kms v1.27.9

pkg/signature/kms/aws/go.sum

@@ -1,5 +1,5 @@
-github.com/aws/aws-sdk-go v1.49.16 h1:KAQwhLg296hfffRdh+itA9p7Nx/3cXS/qOa3uF9ssig=
-github.com/aws/aws-sdk-go v1.49.16/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
+github.com/aws/aws-sdk-go v1.49.21 h1:Rl8KW6HqkwzhATwvXhyr7vD4JFUMi7oXGAw9SrxxIFY=
+github.com/aws/aws-sdk-go v1.49.21/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
 github.com/aws/aws-sdk-go-v2 v1.24.1 h1:xAojnj+ktS95YZlDf0zxWBkbFtymPeDP+rvUQIH3uAU=
 github.com/aws/aws-sdk-go-v2 v1.24.1/go.mod h1:LNh45Br1YAkEKaAqvmE1m8FUx6a5b/V0oAKV7of29b4=
 github.com/aws/aws-sdk-go-v2/config v1.26.3 h1:dKuc2jdp10y13dEEvPqWxqLoc0vF3Z9FC45MvuQSxOA=