Revert "deps: update graphqlplugin to v7"

[MarcelBochtler]

This reverts commit 0dfdaca, because it breaks Java 11 compatibility, see 1.

Trying to build the Docker image using JDK version 11 results in this error with graphql version 7.0:

#12 [build 5/5] RUN --mount=type=cache,target=/tmp/.gradle/     export GRADLE_USER_HOME=/tmp/.gradle/ &&     scripts/export_proxy_certificates.sh /tmp/certificates/ &&     scripts/import_certificates.sh /tmp/certificates/ &&     scripts/set_gradle_proxy.sh &&     ./gradlew --no-daemon --stacktrace -Pversion=968a82e :cli:installDist :helper-cli:startScripts
#12 256.1 
#12 256.1 FAILURE: Build failed with an exception.
#12 256.1 
#12 256.1 * What went wrong:
#12 256.1 A problem occurred configuring project ':clients:github-graphql-client'.
#12 256.1 > Could not resolve all files for configuration ':clients:github-graphql-client:classpath'.
#12 256.1    > Could not resolve com.expediagroup:graphql-kotlin-gradle-plugin:7.0.0.
#12 256.1      Required by:
#12 256.1          project :clients:github-graphql-client > com.expediagroup.graphql:com.expediagroup.graphql.gradle.plugin:7.0.0
#12 256.1       > No matching variant of com.expediagroup:graphql-kotlin-gradle-plugin:7.0.0 was found. The consumer was configured to find a library for use during runtime, compatible with Java 11, packaged as a jar, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '8.3' but:
#12 256.1           - Variant 'apiElements' capability com.expediagroup:graphql-kotlin-gradle-plugin:7.0.0 declares a library, packaged as a jar, and its dependencies declared externally:
#12 256.1               - Incompatible because this component declares a component for use during compile-time, compatible with Java 17 and the consumer needed a component for use during runtime, compatible with Java 11
#12 256.1               - Other compatible attribute:
#12 256.1                   - Doesn't say anything about org.gradle.plugin.api-version (required '8.3')
#12 256.1           - Variant 'javadocElements' capability com.expediagroup:graphql-kotlin-gradle-plugin:7.0.0 declares a component for use during runtime, and its dependencies declared externally:
#12 256.1               - Incompatible because this component declares documentation and the consumer needed a library
#12 256.1               - Other compatible attributes:
#12 256.1                   - Doesn't say anything about its target Java version (required compatibility with Java 11)
#12 256.1                   - Doesn't say anything about its elements (required them packaged as a jar)
#12 256.1                   - Doesn't say anything about org.gradle.plugin.api-version (required '8.3')
#12 256.1           - Variant 'runtimeElements' capability com.expediagroup:graphql-kotlin-gradle-plugin:7.0.0 declares a library for use during runtime, packaged as a jar, and its dependencies declared externally:
#12 256.1               - Incompatible because this component declares a component, compatible with Java 17 and the consumer needed a component, compatible with Java 11
#12 256.1               - Other compatible attribute:
#12 256.1                   - Doesn't say anything about org.gradle.plugin.api-version (required '8.3')
#12 256.1           - Variant 'sourcesElements' capability com.expediagroup:graphql-kotlin-gradle-plugin:7.0.0 declares a component for use during runtime, and its dependencies declared externally:
#12 256.1               - Incompatible because this component declares documentation and the consumer needed a library
#12 256.1               - Other compatible attributes:
#12 256.1                   - Doesn't say anything about its target Java version (required compatibility with Java 11)
#12 256.1                   - Doesn't say anything about its elements (required them packaged as a jar)
#12 256.1                   - Doesn't say anything about org.gradle.plugin.api-version (required '8.3')

[sschuberth]

Ah, yeah I was not reading this sentence from the release notes carefully enough:

With graphql-java finally moving to Java 11 target and Spring Boot v3 requiring Java 17, we also updated our compilation target to Java 17.

Really sad that we're stuck with Java 11 😢