Add Spring Cloud starter bootstrap dependency

#deploy-proxy-oppdrag

Included `spring-cloud-starter-bootstrap` for legacy bootstrap configuration. This will be temporarily used and should be removed once the new configuration is implemented.

proxies/oppdrag-proxy/build.gradle

@@ -16,5 +16,6 @@ dependencies {
     implementation "no.nav.testnav.libs:vault"
 
     implementation "org.springframework.boot:spring-boot-starter-webflux"
+    implementation "org.springframework.cloud:spring-cloud-starter-bootstrap" // TODO remove legacy bootstrap config.
     implementation "org.springframework.cloud:spring-cloud-starter-vault-config"
 }