Fix Voltera V-One recipes and add code signature verification and versioning

[homebysix]

This PR updates the download method for Voltera V-One, and adds code signature verification and versioning to the process.

It also removes the URLDownloaderImproved processor, since it's no longer needed.

Verbose recipe run output:

% autopkg run -vvq 'Voltera/Voltera.download.recipe'
Processing Voltera/Voltera.download.recipe...
WARNING: Voltera/Voltera.download.recipe is missing trust info and FAIL_RECIPES_WITHOUT_TRUST_INFO is not set. Proceeding...
URLDownloader
{'Input': {'filename': 'Voltera.dmg',
           'url': 'https://voltera-styx.herokuapp.com/download/osx'}}
URLDownloader: No value supplied for prefetch_filename, setting default value of: False
URLDownloader: No value supplied for CHECK_FILESIZE_ONLY, setting default value of: False
URLDownloader: Downloaded ~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg
{'Output': {'download_changed': True,
            'pathname': '~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg',
            'url_downloader_summary_result': {'data': {'download_path': '~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg'},
                                              'summary_text': 'The following '
                                                              'new items were '
                                                              'downloaded:'}}}
EndOfCheckPhase
{'Input': {}}
{'Output': {}}
CodeSignatureVerifier
{'Input': {'input_path': '~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg/Voltera.app',
           'requirement': 'identifier "io.Voltera.voltera-styx" and anchor '
                          'apple generic and certificate '
                          '1[field.1.2.840.113635.100.6.2.6] /* exists */ and '
                          'certificate leaf[field.1.2.840.113635.100.6.1.13] '
                          '/* exists */ and certificate leaf[subject.OU] = '
                          '"7Y22ECF4T2"'}}
CodeSignatureVerifier: Mounted disk image ~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg
CodeSignatureVerifier: Verifying code signature...
CodeSignatureVerifier: Deep verification enabled...
CodeSignatureVerifier: Strict verification not defined. Using codesign defaults...
CodeSignatureVerifier: /private/tmp/dmg.cG6fEh/Voltera.app: valid on disk
CodeSignatureVerifier: /private/tmp/dmg.cG6fEh/Voltera.app: satisfies its Designated Requirement
CodeSignatureVerifier: /private/tmp/dmg.cG6fEh/Voltera.app: explicit requirement satisfied
CodeSignatureVerifier: Signature is valid
{'Output': {}}
Versioner
{'Input': {'input_plist_path': '~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg/Voltera.app/Contents/Info.plist',
           'plist_version_key': 'CFBundleShortVersionString'}}
Versioner: No value supplied for skip_single_root_dir, setting default value of: False
Versioner: Mounted disk image ~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg
Versioner: Found version 3.10.7 in file ~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg/Voltera.app/Contents/Info.plist
{'Output': {'version': '3.10.7'}}
Receipt written to ~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/receipts/Voltera.download-receipt-20241225-120453.plist

The following new items were downloaded:
    Download Path
    -------------
    ~/Library/AutoPkg/Cache/com.github.bnpl.autopkg.download.voltera/downloads/Voltera.dmg