update README.md for java 21

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Robert Muir 2024-02-05 10:42:23 -05:00
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@ -39,7 +39,7 @@ comprehensive documentation, visit:
### Basic steps:
1. Install OpenJDK 17 or 18.
1. Install OpenJDK 21.
2. Clone Lucene's git repository (or download the source distribution).
3. Run gradle launcher script (`gradlew`).