Bump com.azure:azure-security-keyvault-secrets in /prime-router

Bumps [com.azure:azure-security-keyvault-secrets](https://github.com/Azure/azure-sdk-for-java) from 4.9.0 to 4.9.1.
- [Release notes](https://github.com/Azure/azure-sdk-for-java/releases)
- [Commits](Azure/azure-sdk-for-java@azure-cosmos_4.9.0...azure-security-keyvault-keys_4.9.1)

---
updated-dependencies:
- dependency-name: com.azure:azure-security-keyvault-secrets
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

prime-router/build.gradle.kts

@@ -868,7 +868,7 @@ dependencies {
     implementation("com.azure:azure-storage-queue:12.22.0") {
         exclude(group = "com.azure", module = "azure-core")
     }
-    implementation("com.azure:azure-security-keyvault-secrets:4.9.0") {
+    implementation("com.azure:azure-security-keyvault-secrets:4.9.1") {
         exclude(group = "com.azure", module = "azure-core")
         exclude(group = "com.azure", module = "azure-core-http-netty")
     }