Update minimum JDK to 21.

Author: Jadarma

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
       - name: 'Setup Java'
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'adopt'
       - name: 'Setup Gradle'
         uses: gradle/actions/setup-gradle@v4

.github/workflows/publish.yml

@@ -25,7 +25,7 @@ jobs:
       - name: 'Setup Java'
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'adopt'
       - name: 'Setup Gradle'
         uses: gradle/actions/setup-gradle@v4

docs/topics/changelog.md

@@ -2,6 +2,7 @@
 
 ## 0.3.0-SNAPSHOT
 
+- Updated minimum JDK to 21.
 - Updated Kotlin to `2.2.10` and Kotest to `6.0.3`.
 - There are no breaking changes to AocKt itself, but there are for configuring 
   [Kotest 6.0](https://kotest.io/docs/release6).

gradle/build-logic/src/main/kotlin/CompileOptions.kt

@@ -10,7 +10,7 @@ import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 object CompileOptions {
 
     object Java {
-        val languageVersion: JavaLanguageVersion = JavaLanguageVersion.of(17)
+        val languageVersion: JavaLanguageVersion = JavaLanguageVersion.of(21)
         val jvmVendor: JvmVendorSpec = JvmVendorSpec.ADOPTIUM
     }