feat: #250 migrate from spring boot 2.7.3 to 3.3.1 and #269 update pipeline from java 17 to 21

[SalathielGenese]

Closes #250
Closes #269

• Update documentation
• Fix bugs

[FanJups]

@SalathielGenese , please what do you think if we delete these in dependencyManagement ? Are they useful ? I commented these lines locallly and there is no impact.

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-framework-bom</artifactId>
                <version>5.3.22</version>
            </dependency>

            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>2021.0.4</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

[FanJups]

Nice work, we did it 💯