Spring Boot 2.x reached EOL. Your workloads didn't.

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>io.osseva.spring</groupId>
      <artifactId>spring-boot-dependencies</artifactId>
      <version>2.7.18-osseva-2</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

repositories {
  maven {
    url "https://artifacts.osseva.io/maven"
    credentials {
      username System.getenv("OSSEVA_USER")
      password System.getenv("OSSEVA_TOKEN")
    }
  }
}

dependencies {
  implementation platform("io.osseva.spring:spring-boot-dependencies:2.7.18-osseva-2")
  implementation "org.springframework.boot:spring-boot-starter-web"
}