refactor(clippy): apply semicolon_if_nothing_returned clippy lint

[nejcgalof]

Description

Apply semicolon_if_nothing_returned clippy lint from the pedantic group.

Motivation and Context

Some of the checks from pedantic group are very useful to apply into the project. I will select the useful ones, and apply each to own MR, for maintainer to easy see the changes and easier decided which he want to apply and which not.
I think it's useful to apply them every once in a while, but not to use them by default.

I use the refactor(clippy) format for my commits, which is omitted from the changelog report.

I also apply those changes to get more familiar with the project and later I will take some of the open issues.

How Has This Been Tested?

I ran the specific lint checks and solved the problem until the linter no longer told me any issue.
Command:

cargo clippy --all-targets -- -D warnings -W clippy::semicolon_if_nothing_returned

The cargo build and test passed successfully. Standard usage of linter and formatter also passed.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 39.94%. Comparing base (a82dac3) to head (0c9d470).

Files with missing lines	Patch %	Lines
git-cliff/src/lib.rs	0.00%	4 Missing ⚠️
git-cliff-core/src/commit.rs	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #851   +/-   ##
=======================================
  Coverage   39.94%   39.94%           
=======================================
  Files          20       20           
  Lines        1660     1660           
=======================================
  Hits          663      663           
  Misses        997      997           

Flag	Coverage Δ
unit-tests	39.94% <37.50%> (ø)

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[orhun]

@nejcgalof would you be also interested in submitting a PR for enabling the pedantic clippy checks in CI? I'm guessing it should be either a warn annotation in lib.rs or some command line argument addition to cargo clippy command.

[nejcgalof]

@orhun Of course. I will do it :)