Drop support for Java 8 and 11 from github workflows

.github/workflows/pull-request-without-code.yml

diff --git a/.github/workflows/pull-request-without-code.yml b/.github/workflows/pull-request-without-code.yml
index 233f06a..da69d49 100644
--- a/.github/workflows/pull-request-without-code.yml
+++ b/.github/workflows/pull-request-without-code.yml
@@ -45,7 +45,7 @@
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        jdk: [ 17, 21 ] # list of Java versions (usually only LTS versions) to run tests against (excluding `java-compilation` version for which tests already have run during `build` job)
+        jdk: [17, 21] # list of Java versions (usually only LTS versions) to run tests against (excluding `java-compilation` version for which tests already have run during `build` job)
     runs-on: ${{ matrix.os }}
     name: "[tests] OS=${{ matrix.os }}, Java=${{ matrix.jdk }}"
     steps:

build-logic/src/main/kotlin/KotlinCommonPlugin.kt

diff --git a/build-logic/src/main/kotlin/KotlinCommonPlugin.kt b/build-logic/src/main/kotlin/KotlinCommonPlugin.kt
index 70fd9dc..fd4f9c9 100644
--- a/build-logic/src/main/kotlin/KotlinCommonPlugin.kt
+++ b/build-logic/src/main/kotlin/KotlinCommonPlugin.kt
@@ -50,7 +50,7 @@
 
             val requestedJdkVersion = project.findProperty("testJdkVersion")?.toString()?.toInt()
             // list of Java versions (usually only LTS versions) the developers may want to run via IDE click.
-            setOfNotNull(8, 11, 17, 21, requestedJdkVersion).forEach { version ->
+            setOfNotNull(17, 21, requestedJdkVersion).forEach { version ->
                 tasks.register<Test>("testOnJdk$version") {
                     javaLauncher.set(
                         target