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

Bumps [io.sentry:sentry](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
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/build.gradle.kts

@@ -80,8 +80,8 @@ dependencies {
     api("io.hypersistence:hypersistence-utils-hibernate-63:3.9.0")
     api("org.locationtech.jts:jts-core:1.20.0")
     api("org.hibernate:hibernate-spatial:6.6.4.Final")
-    api("io.sentry:sentry:7.19.1")
-    api("io.sentry:sentry-log4j2:7.19.1")
+    api("io.sentry:sentry:8.1.0")
+    api("io.sentry:sentry-log4j2:8.1.0")
     implementation("org.springframework.cloud:spring-cloud-gateway-mvc:4.2.0")
     runtimeOnly("org.postgresql:postgresql:42.7.4")
     testImplementation("io.ktor:ktor-client-mock-jvm:3.0.3")