Add pending changelog entry for the previous commit

diff --git a/pending_changelog/3160-format-change.txt b/pending_changelog/3160-format-change.txt
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+## Backwards Compatibility
+ * `impl_writeable_tlv_based_enum[_upgradable]`'s writing of tuple variants has
+   changed format. Users of this macro who are reading/writing tuple variants
+   will need to perform a format-change to update their serialized data (#3160).