Enable JDK 8 compatibility about grgit HOT 4 CLOSED

* What went wrong:
Execution failed for task ':buildSrc:compileJava'.
> Could not resolve all files for configuration ':buildSrc:compileClasspath'.
   > Could not resolve org.ajoberstar.grgit:grgit-gradle:latest.release.
     Required by:
         project :buildSrc
      > No matching variant of org.ajoberstar.grgit:grgit-gradle:5.0.0 was found. The consumer was configured to find an API of a library compatible with Java 8, preferably not packaged as a jar, preferably optimized for standard JVMs, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '7.6' but:
          - Variant 'apiElements' capability org.ajoberstar.grgit:grgit-gradle:5.0.0 declares an API of a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component compatible with Java 11 and the consumer needed a component compatible with Java 8
              - Other compatible attributes:
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'javadocElements' capability org.ajoberstar.grgit:grgit-gradle:5.0.0 declares a runtime of a component, and its dependencies declared externally:
              - Incompatible because this component declares documentation and the consumer needed a library
              - Other compatible attributes:
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
                  - Doesn't say anything about its target Java version (required compatibility with Java 8)
                  - Doesn't say anything about its elements (required them preferably not packaged as a jar)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'runtimeElements' capability org.ajoberstar.grgit:grgit-gradle:5.0.0 declares a runtime of a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component compatible with Java 11 and the consumer needed a component compatible with Java 8
              - Other compatible attributes:
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'sourcesElements' capability org.ajoberstar.grgit:grgit-gradle:5.0.0 declares a runtime of a component, and its dependencies declared externally:
              - Incompatible because this component declares documentation and the consumer needed a library
              - Other compatible attributes:
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
                  - Doesn't say anything about its target Java version (required compatibility with Java 8)
                  - Doesn't say anything about its elements (required them preferably not packaged as a jar)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')