Use crc32 hashes for binary delta version 4

[zorgiepoo]

Use CRC32 hashes for before/after bundle hashes for version 4 format, which is more efficient than SHA1.

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)

Tested applying binary delta version 4 patch (with BinaryDelta) on:
macOS 15.0 (24A335)
macOS 10.14 VM

Tested creating/applying binary delta version 3 patch still works (with BinaryDelta)