Update module github.com/mmcdole/gofeed to v1.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/mmcdole/gofeed	require	patch	v1.2.0 -> v1.2.1

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Release Notes

mmcdole/gofeed

### [`v1.2.1`](https://togithub.com/mmcdole/gofeed/releases/tag/v1.2.1) [Compare Source](https://togithub.com/mmcdole/gofeed/compare/v1.2.0...v1.2.1) Fixes concurrency / thread safety issues when re-using a parser.

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