Adding missing 'void' in function declarations

[LowAmmo]

• Addresses a build warning in Xcode 14.3

New Pull Request Checklist

• I have read and understood the CONTRIBUTING guide
• I have read the Documentation
• I have searched for a similar pull request in the project and found none

• I have updated this branch with the latest master to avoid conflicts (via merge from master or rebase)
• I have added the required tests to prove the fix/feature I am adding
• I have updated the documentation (if necessary)
• I have run the tests and they pass
• I have run the lint and it passes (pod lib lint)

This merge request fixes / refers to the following issues: #1338

Pull Request Description

Add "void" to function declarations that take no arguments (seems to be a new standard with Xcode 14.3)

[github-actions]

	Warnings
⚠️	Any changes to library code should be reflected in the CHANGELOG. Please consider adding a note there about your change.
⚠️	The library files were changed, but the tests remained unmodified. Consider updating or adding to the tests to match the library changes.

Generated by 🚫 Danger Swift against 53e510a

[ffried]

Looks good, thanks!
I don't think we have any backwards compatibility issues here. This should work for previous versions of Xcode as well.

[codecov]

Codecov Report

Merging #1340 (53e510a) into master (3bd7b2f) will decrease coverage by 0.41%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #1340      +/-   ##
==========================================
- Coverage   49.41%   49.00%   -0.41%     
==========================================
  Files          32       32              
  Lines        5304     5140     -164     
  Branches      481      455      -26     
==========================================
- Hits         2621     2519     -102     
+ Misses       2509     2443      -66     
- Partials      174      178       +4     

Impacted Files	Coverage Δ
Sources/CocoaLumberjack/DDFileLogger.m	50.85% <ø> (-3.19%)	⬇️
...ocoaLumberjack/Extensions/DDFileLogger+Buffering.m	73.21% <50.00%> (ø)

... and 5 files with indirect coverage changes

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