Deprecate custom version comparators

[zorgiepoo]

Fixes #2585

Misc Checklist

• My change requires a documentation update on Sparkle's website repository
• My change requires changes to generate_appcast, generate_keys, or sign_update

Testing

I tested and verified my change by using one or multiple of these methods:

• Sparkle Test App
• Unit Tests
• My own app
• Other (please specify)

[github-actions]

/Users/runner/work/Sparkle/Sparkle/Sparkle/SUUpdater.m:463:1: warning: implementing deprecated method [-Wdeprecated-implementations] - (id<SUVersionComparison>)versionComparatorForUpdater:(SPUUpdater *)__unused updater ^ In file included from /Users/runner/work/Sparkle/Sparkle/Sparkle/SUUpdater.m:15: /Users/runner/work/Sparkle/Sparkle/Sparkle/SPUUpdaterDelegate.h:389:1: note: method 'versionComparatorForUpdater:' declared here - (nullable id<SUVersionComparison>)versionComparatorForUpdater:(SPUUpdater *)updater __deprecated_msg("Custom version comparators are deprecated because they are incompatible with how the system compares different versions of an app."); ^ 1 warning generated. /Users/runner/work/Sparkle/Sparkle/Sparkle/SUUpdater.m:463:1: warning: implementing deprecated method [-Wdeprecated-implementations] - (id<SUVersionComparison>)versionComparatorForUpdater:(SPUUpdater *)__unused updater ^ In file included from /Users/runner/work/Sparkle/Sparkle/Sparkle/SUUpdater.m:15: /Users/runner/work/Sparkle/Sparkle/Sparkle/SPUUpdaterDelegate.h:389:1: note: method 'versionComparatorForUpdater:' declared here - (nullable id<SUVersionComparison>)versionComparatorForUpdater:(SPUUpdater *)updater __deprecated_msg("Custom version comparators are deprecated because they are incompatible with how the system compares different versions of an app."); ^ 1 warning generated. note: Run script build phase 'Strip Framework' will be run during every build because the option to run the script phase "Based on dependency analysis" is unchecked. (in target 'Sparkle' from project 'Sparkle') note: Run script build phase 'Run Script: Set Git Version Info' will be run during every build because the option to run the script phase "Based on dependency analysis" is unchecked. (in target 'Sparkle' from project 'Sparkle') note: Run script build phase 'Run Script: Link Tools' will be run during every build because the option to run the script phase "Based on dependency analysis" is unchecked. (in target 'Sparkle' from project 'Sparkle')