8313809: String template fails with java.lang.StringIndexOutOfBoundsException if last fragment is UTF16
------------- Commit messages: - Backport 6864441163f946d0bec7380a2a120e31b812a6dc Changes: https://git.openjdk.org/jdk21/pull/170/files Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=170&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8313809 Stats: 49 lines in 2 files changed: 45 ins; 2 del; 2 mod Patch: https://git.openjdk.org/jdk21/pull/170.diff Fetch: git fetch https://git.openjdk.org/jdk21.git pull/170/head:pull/170 PR: https://git.openjdk.org/jdk21/pull/170
