Mention #10343 in changelog for 2.14.5

The problem was only noticed after the changelog already got merged, hence this
has to be added retroactively.

Author: julianbrost

CHANGELOG.md

@@ -19,6 +19,7 @@ various documentation improvements.
 
 * Don't close anonymous connections before sending the response for a certificate request #10337
 * Performance data: Don't discard min/max values even if crit/warn thresholds aren’t given #10339
+* Fix a failing test case on systems `time_t` is only 32 bits #10343
 
 ### Documentation