fix(deps): update dependency org.springframework.boot:spring-boot-starter-parent to v4 (#1699)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[org.springframework.boot:spring-boot-starter-parent](https://spring.io/projects/spring-boot)
([source](https://redirect.github.com/spring-projects/spring-boot)) |
`3.5.8` -> `4.0.0` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/org.springframework.boot:spring-boot-starter-parent/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/org.springframework.boot:spring-boot-starter-parent/3.5.8/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>spring-projects/spring-boot
(org.springframework.boot:spring-boot-starter-parent)</summary>

###
[`v4.0.0`](https://redirect.github.com/spring-projects/spring-boot/compare/v3.5.8...v4.0.0)

[Compare
Source](https://redirect.github.com/spring-projects/spring-boot/compare/v3.5.8...v4.0.0)

</details>

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View the [repository job
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---------

Signed-off-by: Gregor Zeitlinger <[email protected]>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Gregor Zeitlinger <[email protected]>

Author: renovate[bot]

integration-tests/it-spring-boot-smoke-test/pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>3.5.8</version>
+    <version>4.0.0</version>
     <relativePath/> <!-- lookup parent from repository -->
   </parent>
 

integration-tests/it-spring-boot-smoke-test/src/test/java/io/prometheus/metrics/it/springboot/ApplicationTest.java

@@ -9,11 +9,9 @@
 import java.util.List;
 import java.util.Optional;
 import org.junit.jupiter.api.Test;
-import org.springframework.boot.test.autoconfigure.actuate.observability.AutoConfigureObservability;
 import org.springframework.boot.test.context.SpringBootTest;
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
-@AutoConfigureObservability
 class ApplicationTest {
   @Test
   public void testPrometheusProtobufFormat() throws IOException {