Move semicolon_if_nothing_returned to pedantic

[mbartlett21]

This moves the semicolon_if_nothing_returned lint to pedantic category.
I had done #7148, but on the master branch, and Github doesn't seem to let me change that, so here's another PR

changelog: Move [semicolon_if_nothing_returned] lint into pedantic category.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @Manishearth (or someone else) soon.

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[Manishearth]

@bors r+

[bors]

📌 Commit 1ac7e19 has been approved by Manishearth

[bors]

⌛ Testing commit 1ac7e19 with merge c939887...

[bors]

💔 Test failed - checks-action_test

[Manishearth]

Ah, we need to fix this lint for most of clippy (which runs under pedantic).

I'm also okay #[allow()]ing it :)

[mbartlett21]

@rustbot modify labels to +S-waiting-on-author -S-waiting-on-review

[mbartlett21]

I think this should all be good now.

@rustbot label +S-waiting-on-review -S-waiting-on-author

[Manishearth]

@bors r+

[bors]

📌 Commit 0c017ea has been approved by Manishearth

[bors]

⌛ Testing commit 0c017ea with merge 513c0eb...

[bors]

💔 Test failed - checks-action_dev_test

[mbartlett21]

I think this should all be good now.

... And I forgot to format.

@bors try

[bors]

@mbartlett21: 🔑 Insufficient privileges: not in try users

[giraffate]

@bors retry

[giraffate]

@bors r=Manishearth

[bors]

📌 Commit bcebea6 has been approved by Manishearth

[bors]

⌛ Testing commit bcebea6 with merge cd4abf9...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: Manishearth
Pushing cd4abf9 to master...