Updated dependencies for v0.1.0-beta

[lhstrh]

• Refactor Gradle configuration to have all version numbers in a single file
• Bump versions of dependencies:
  • lsp4j 0.10.0 -> 0.12.0
  • shadowJar 6.0.0 -> 7.1.2
  • xtext-gradle-plugin -> 2.0.8 -> 3.0.0
  • gradle 6.5 -> 7.0
  • junit 4.12 -> 4.13.2
  • junit-jupiter-* 5.7.2 -> 5.8.2
  • junit-platform-* 1.7.2 -> 1.8.2
  • eclipse.core.runtime 3.22.0 -> 3.24.0
  • eclipse.core.resources 3.15.0 -> 3.16.0
  • exec-maven-plugin 1.6.0 -> 3.0.0
• Added a version update script (@housengw)

[lhstrh]

To update the Xtext version for the Eclipse build:

find . -name *.MF -print0 | xargs -0 -n1 sed -i 's/2\.25\.0/2\.26\.0.M2/'

To update the Xtext version for Gradle:

find . -name 'gradle.properties' -print0 | xargs -0 -n1 sed -i 's/2\.25\.0/2\.26\.0.M2/'

To update the Xtext version for Maven:

find . -name 'pom.xml' -print0 | xargs -0 -n1 sed -i 's/2\.25\.0/2\.26\.0.M2/'

[Soroosh129]

Looks good to me!
I didn't run the bump-versions Python script but I didn't see any issues just from reading the code.