docs: add changelog entry for #12880

changes/fix-12880.en.md

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+Fixed the issue where serialization failed when the value in the tag set used a literal value (int or float) in the influxdb action configuration.
+
+Which Tag Set value's type is always `String`. See also: [Line Protocol - Tag Set](https://docs.influxdata.com/influxdb/v2/reference/syntax/line-protocol/#tag-set)