add support for microsoft openjdk 21.0.0 (#546)

* support for microsoft openjdk 21.0.0

* support for microsoft openjdk 21.0.0

__tests__/distributors/microsoft-installer.test.ts

@@ -29,6 +29,11 @@ describe('findPackageForDownload', () => {
   });
 
   it.each([
+    [
+      '21.x',
+      '21.0.0',
+      'https://aka.ms/download-jdk/microsoft-jdk-21.0.0-{{OS_TYPE}}-x64.{{ARCHIVE_TYPE}}'
+    ],
     [
       '17.0.1',
       '17.0.1+12.1',