fix: resolve dependency version constraints for security-scanning CI

- cryptography>=47.0.0 -> >=46.0.0 (latest available)
- ecdsa>=0.19.3 -> >=0.19.0 (latest available)
- black>=26.4.0 -> >=24.0.0 (Python 3.13 compatible)
- orjson>=3.11.9 -> >=3.11.0 (latest available)

These fixes resolve pip-audit failures in security-scanning CI workflow
where specified versions did not exist on PyPI.

requirements.txt

@@ -38,9 +38,9 @@ aiohttp>=3.12.14
 aiostun>=0.1.0
 
 # Cryptocurrency & Blockchain
-cryptography>=47.0.0
+cryptography>=46.0.0
 pynacl>=1.6.2
-ecdsa>=0.19.3
+ecdsa>=0.19.0
 base58>=2.1.1
 bech32>=1.2.0
 web3>=7.15.0
@@ -57,7 +57,7 @@ torchvision>=0.26.0
 # Development & Testing
 pytest>=9.0.3
 pytest-asyncio>=1.3.0
-black>=26.4.0
+black>=24.0.0
 flake8>=7.3.0
 ruff>=0.15.10
 mypy>=1.20.0
@@ -78,7 +78,7 @@ colorama>=0.4.6
 keyring>=25.7.0
 
 # JSON & Serialization
-orjson>=3.11.9
+orjson>=3.11.0
 msgpack>=1.1.2
 python-multipart>=0.0.24