Bump cloud.google.com/go/kms from 1.15.2 to 1.15.3

Bumps [cloud.google.com/go/kms](https://github.com/googleapis/google-cloud-go) from 1.15.2 to 1.15.3.
- [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/v1.15.2...kms/v1.15.3)

---
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 1.20
 
 require (
-	cloud.google.com/go/kms v1.15.2
+	cloud.google.com/go/kms v1.15.3
 	filippo.io/edwards25519 v1.0.0
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.8.0
 	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.3.1

go.sum

@@ -46,8 +46,8 @@ 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 v1.1.1 h1:lW7fzj15aVIXYHREOqjRBV9PsH0Z6u8Y46a1YGvQP4Y=
 cloud.google.com/go/iam v1.1.1/go.mod h1:A5avdyVL2tCppe4unb0951eI9jreack+RJ0/d+KUZOU=
-cloud.google.com/go/kms v1.15.2 h1:lh6qra6oC4AyWe5fUUUBe/S27k12OHAleOOOw6KakdE=
-cloud.google.com/go/kms v1.15.2/go.mod h1:3hopT4+7ooWRCjc2DxgnpESFxhIraaI2IpAVUEhbT/w=
+cloud.google.com/go/kms v1.15.3 h1:RYsbxTRmk91ydKCzekI2YjryO4c5Y2M80Zwcs9/D/cI=
+cloud.google.com/go/kms v1.15.3/go.mod h1:AJdXqHxS2GlPyduM99s9iGqi2nwbviBbhV/hdmt4iOQ=
 cloud.google.com/go/monitoring v0.1.0/go.mod h1:Hpm3XfzJv+UTiXzCG5Ffp0wijzHTC7Cv4eR7o3x/fEE=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=