[Tech] Bump io.sentry:sentry-log4j2 from 7.19.1 to 8.1.0 in /backend

Bumps [io.sentry:sentry-log4j2](https://github.com/getsentry/sentry-java) from 7.19.1 to 8.1.0.
- [Release notes](https://github.com/getsentry/sentry-java/releases)
- [Changelog](https://github.com/getsentry/sentry-java/blob/main/CHANGELOG.md)
- [Commits](getsentry/sentry-java@7.19.1...8.1.0)

---
updated-dependencies:
- dependency-name: io.sentry:sentry-log4j2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/build.gradle.kts

@@ -72,7 +72,7 @@ dependencies {
     implementation("io.ktor:ktor-client-content-negotiation-jvm:3.0.3")
     implementation("io.ktor:ktor-serialization-kotlinx-json-jvm:3.0.3")
     implementation("io.sentry:sentry:7.19.1")
-    implementation("io.sentry:sentry-log4j2:7.19.1")
+    implementation("io.sentry:sentry-log4j2:8.1.0")
     implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.7.0")
     runtimeOnly("org.springframework.boot:spring-boot-devtools:3.4.1")
     runtimeOnly("org.postgresql:postgresql:42.7.4")