Upgrade major versions of kotlin, gradle and other dependencies

[DigitalSeneca]

• Upgrade kotlin, gradle and java to make easier the introduction of fastlane in Automate release of new versions to google play / apple store #207
• Use flutter pub outdated to detect upgradable dependencies

[DigitalSeneca]

Solves this build error due to inconsistency with new kotlin version
https://stackoverflow.com/a/71194804

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugKotlin'.
> Inconsistent JVM-target compatibility detected for tasks 'compileDebugJavaWithJavac' (18) and 'compileDebugKotlin' (17).

  Consider using JVM Toolchain: https://kotl.in/gradle/jvm/toolchain
  Learn more about JVM-target validation: https://kotl.in/gradle/jvm/target-validation     

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 8s