Bump spring-boot-starter-web in /promql_client_test

Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 1.5.6.RELEASE to 2.5.12.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v1.5.6.RELEASE...v2.5.12)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-web
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

promql_client_test/pom.xml

@@ -28,7 +28,7 @@
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
-			<version>1.5.6.RELEASE</version>
+			<version>2.5.12</version>
 		</dependency>
 		<dependency>
 			<groupId>junit</groupId>