Release notes - Sonar Scanner for Maven - 5.3

SCANMAVEN-283 Mvn 4.0.0-rc-3 breaks scanner because change of API

SCANMAVEN-308 Toolchains are not properly discovered by the scanner with Maven 4

SCANMAVEN-297 Update README.md with copy from Product Marketing

SCANMAVEN-301 PrepareNextIteration.yml: add recent improvements

SCANMAVEN-302 Update GH release and releasability actions

SCANMAVEN-303 Delete mend_scan_task

SCANMAVEN-305 Migrate Cirrus build to Github actions

SCANMAVEN-307 Migrate QA from Cirrus to Github action

SCANMAVEN-309 Prevent injection in PrepareNextIteration GHA

SCANMAVEN-310 Exclude test projects from SCA

SCANMAVEN-311 Upgrade dependencies

SCANMAVEN-314 Fix ProxyTest on GitHub actions

SCANMAVEN-315 Rework QA: split invoker-based ITs and Orchestrator-based e2e

SCANMAVEN-325 Update license header from SonarSource SA to SonarSource Sàrl

SCANMAVEN-326 Delete Cirrus CI config

SCANMAVEN-327 Use explicit build number

SonarSource/sonar-scanner-maven 5.3.0.6276 on GitHub