### Description
Make `./gradlew checkstyle` much faster by registering a task for each
module and letting Gradle run those in parallel.
Before: 27 seconds, every time you run it (no caching)
After: 18 seconds, 2s on subsequent runs (if only a few code files were
touched)
Also, upgrade checkstyle version
### Checklist
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- [x] I have performed a self-review of my code, going through my
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- [x] I have run the automated code checks using `./gradlew checkstyle
spotbugsPlayDebug spotbugsDebug :app:lintPlayDebug`
- [x] My code follows the style guidelines of the AntennaPod project:
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### Description
Add `synopsis` comment as an alternative to description to vorbis
parser. Looks like some tools generate this instead of the more standard
comments.
Closes#8269
### Checklist
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- [x] I have read the contribution guidelines:
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- [x] I have performed a self-review of my code
- [x] I have run the automated code checks using `./gradlew checkstyle
spotbugsPlayDebug spotbugsDebug :app:lintPlayDebug`
- [x] My code follows the style guidelines of the AntennaPod project:
https://antennapod.org/contribute/develop/app/code-style
- [x] I have mentioned the corresponding issue and the relevant keyword
(e.g., "Closes: #xy") in the description (see
https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
- [x] If it is a core feature, I have added automated tests
