Bump org.springframework.vault:spring-vault-core from 3.0.4 to 3.1.2

Bumps [org.springframework.vault:spring-vault-core](https://github.com/spring-projects/spring-vault) from 3.0.4 to 3.1.2.
- [Release notes](https://github.com/spring-projects/spring-vault/releases)
- [Commits](spring-projects/spring-vault@3.0.4...3.1.2)

---
updated-dependencies:
- dependency-name: org.springframework.vault:spring-vault-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -56,7 +56,7 @@ dependencies {
     implementation("ch.qos.logback:logback-classic:${logbackVersion}")
 
     // spring
-    implementation("org.springframework.vault:spring-vault-core:3.0.4")
+    implementation("org.springframework.vault:spring-vault-core:3.1.2")
     implementation("org.hibernate.validator:hibernate-validator:8.0.1.Final")
     implementation("org.springframework.boot:spring-boot-starter-thymeleaf")