Update lombok version for JDK16

Building the project whit a JDK in version 16 or newer fails due to the following error:

Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project sila_base: Fatal error compiling: java.lang.IllegalAccessError: class lombok.javac.apt.LombokProcessor (in unnamed module @0x502dbc22) cannot access class com.sun.tools.javac.processing.JavacProcessingEnvironment (in module jdk.compiler) because module jdk.compiler does not export com.sun.tools.javac.processing to unnamed module @0x502dbc22 -> [Help 1]

See: lombok_issues_2681

Patch to fix this issue by bumping the lombok version up to 1.18.20 is attached here:

0001-chore-Bump-lombok-version-to-enable-builds-with-JDK16.patch