refactor: drop protonlabs/bitcoin dependency - #203

https://app.clickup.com/t/86e3uf66e

drops protonlabs/bitcoin (+ the abandoned phpecc / phpasn1 it pulls in), which spam deprecations on PHP 8.4+ as soon as you sign or verify anything. ECDSA now uses simplito/elliptic-php (was already a dep), base58check / hashing / WIF live in the package

also bumped everything to PHP 8.5: Pest 5, latest php-cs-fixer (and fixed its deprecated rules), CI on 8.5, tests moved to it(), and removed graham-campbell/analyzer, illuminate/support and the parallel plugin since they aren't needed anymore

breaking, so this needs a major

• requires PHP ^8.5
• keys are the package's own PrivateKey / PublicKey now, not the BitWasp classes. getHex(), getPublicKey() and toWif() work the same
• sign() returns the DER Bytes, so ->sign($hash)->getBuffer()->getHex() is now ->sign($hash)->getHex()
• getBytes() / serialize() return Binary\Bytes (getHex() / getBinary() unchanged)
• AbstractNetwork doesn't extend the BitWasp network anymore, which means arkscan needs a one-line change in app/Contracts/Network.php when it upgrades

tested

• compared 600 random cases against 1.9.0 (11,400 checks): signatures, keys, addresses and WIF are byte-identical
• new fixture with vectors generated by ARK Core's @arkecosystem/crypto, must match exactly
• 0 deprecations on 8.5, and sign/verify are ~5x/3x faster

also fixes Message::sign() breaking on messages that aren't valid utf-8