Bump cloud.google.com/go/kms from 1.20.3 to 1.20.4

Bumps [cloud.google.com/go/kms](https://github.com/googleapis/google-cloud-go) from 1.20.3 to 1.20.4.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/main/CHANGES.md)
- [Commits](googleapis/google-cloud-go@kms/v1.20.3...kms/v1.20.4)

---
updated-dependencies:
- dependency-name: cloud.google.com/go/kms
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -3,7 +3,7 @@ module go.step.sm/crypto
 go 1.22
 
 require (
-	cloud.google.com/go/kms v1.20.3
+	cloud.google.com/go/kms v1.20.4
 	filippo.io/edwards25519 v1.1.0
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.16.0
 	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.0

go.sum

@@ -49,8 +49,8 @@ cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1
 cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
 cloud.google.com/go/iam v1.2.2 h1:ozUSofHUGf/F4tCNy/mu9tHLTaxZFLOUiKzjcgWHGIA=
 cloud.google.com/go/iam v1.2.2/go.mod h1:0Ys8ccaZHdI1dEUilwzqng/6ps2YB6vRsjIe00/+6JY=
-cloud.google.com/go/kms v1.20.3 h1:a61yIN5LN8ozWxOC6tjUx5V5SEzfkS+b69kYMQfzGzE=
-cloud.google.com/go/kms v1.20.3/go.mod h1:YvX+xhp2E2Sc3vol5IcRlBhH14Ecl3kegUY/DtH7EWQ=
+cloud.google.com/go/kms v1.20.4 h1:CJ0hMpOg1ANN9tx/a/GPJ+Uxudy8k6f3fvGFuTHiE5A=
+cloud.google.com/go/kms v1.20.4/go.mod h1:gPLsp1r4FblUgBYPOcvI/bUPpdMg2Jm1ZVKU4tQUfcc=
 cloud.google.com/go/longrunning v0.6.2 h1:xjDfh1pQcWPEvnfjZmwjKQEcHnpz6lHjfy7Fo0MK+hc=
 cloud.google.com/go/longrunning v0.6.2/go.mod h1:k/vIs83RN4bE3YCswdXC5PFfWVILjm3hpEUlSko4PiI=
 cloud.google.com/go/monitoring v0.1.0/go.mod h1:Hpm3XfzJv+UTiXzCG5Ffp0wijzHTC7Cv4eR7o3x/fEE=