[jdk21] RFR: 8312985: Remove EA from the JDK 21 version string with first RC promotion on August 10, 2023

[Jesper Wilhelmsson]

JDK-8312985: Remove EA from the JDK 21 version string with first RC promotion on August 10, 2023

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Commit messages:
 - Removed EA

Changes: https://git.openjdk.org/jdk21/pull/165/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=165&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312985
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21/pull/165.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/165/head:pull/165

PR: https://git.openjdk.org/jdk21/pull/165