Add changelog entry for #3382

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
diff --git a/ChangeLog.d/do_not_persist_volatile_external_keys.txt b/ChangeLog.d/do_not_persist_volatile_external_keys.txt
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+++ b/ChangeLog.d/do_not_persist_volatile_external_keys.txt
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+Default behavior changes
+   * Stop storing persistent information about externally stored keys created
+     through PSA Crypto with a volatile lifetime. Reported in #3288 and
+     contributed by Steven Cooreman in #3382.
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