(*) Upgrade to JDK21 with preview enabled.

... also move some common configuration into the root build.gradle-file.

Support for JDK21 in lombok is a bit sketchy at the moment, but it seems to work.  This upgrade is kind of important as the new index construction really benefits from Arena based lifecycle control over off-heap memory.

third-party/commons-codec/build.gradle

@@ -5,7 +5,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/count-min-sketch/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/monkey-patch-gson/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/monkey-patch-opennlp/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/openzim/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/parquet-floor/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/porterstemmer/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/rdrpostagger/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/symspell/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/uppend/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }
 

third-party/xz/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }