fix: update lxml constraint and pyplayready import path

- Update lxml dependency to allow version 6.x (required by subby 0.3.23)
- Fix pyplayready exception import path (moved to misc.exceptions in 0.6.3)

fixes #17

pyproject.toml

@@ -33,7 +33,7 @@ dependencies = [
     "crccheck>=1.3.0,<2",
     "jsonpickle>=3.0.4,<4",
     "langcodes>=3.4.0,<4",
-    "lxml>=5.2.1,<6",
+    "lxml>=5.2.1,<7",
     "pproxy>=2.7.9,<3",
     "protobuf>=4.25.3,<5",
     "pycaption>=2.2.6,<3",

unshackle/commands/prd.py

@@ -8,7 +8,7 @@ from Crypto.Random import get_random_bytes
 from pyplayready.cdm import Cdm
 from pyplayready.crypto.ecc_key import ECCKey
 from pyplayready.device import Device
-from pyplayready.exceptions import InvalidCertificateChain, OutdatedDevice
+from pyplayready.misc.exceptions import InvalidCertificateChain, OutdatedDevice
 from pyplayready.system.bcert import Certificate, CertificateChain
 from pyplayready.system.pssh import PSSH