build: use Java 21

Signed-off-by: Kengo TODA <skypencil@gmail.com>
KengoTODA · Mar 27, 2024 · acb1301 · acb1301
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commit acb1301
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diff --git a/.idea/compiler.xml b/.idea/compiler.xml
diff --git a/.idea/misc.xml b/.idea/misc.xml
diff --git a/.java-version b/.java-version
@@ -1 +1 @@
-22
+21