Bump micronaut from 3.7.1 to 5.0.3

Bumps `micronaut` from 3.7.1 to 5.0.3.

Updates `io.micronaut:micronaut-http` from 3.7.1 to 5.0.3
- [Release notes](https://github.com/micronaut-projects/micronaut-core/releases)
- [Changelog](https://github.com/micronaut-projects/micronaut-core/blob/5.1.x/RELEASE.adoc)
- [Commits](micronaut-projects/micronaut-core@v3.7.1...v5.0.3)

Updates `io.micronaut.data:micronaut-data-model` from 3.7.1 to 5.0.3
- [Release notes](https://github.com/micronaut-projects/micronaut-data/releases)
- [Commits](micronaut-projects/micronaut-data@v3.7.1...v5.0.3)

---
updated-dependencies:
- dependency-name: io.micronaut:micronaut-http
  dependency-version: 5.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: io.micronaut.data:micronaut-data-model
  dependency-version: 5.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -12,7 +12,7 @@ base = "2026.3"
 jacoco = "0.8.14"
 jacocolog = "4.0.1"
 
-micronaut = "3.7.1"
+micronaut = "5.0.3"
 
 [libraries]
 openapi-processor-api = { module = "io.openapiprocessor:openapi-processor-api", version.ref = "api" }