blockfrost Backend _get_script patches (#428)

* Update blockfrost.py

cast script_type to int for the method PlutusScript.from_version

* Update blockfrost.py

capitalisation mistake startswith in _gets_script

* Fix format

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Co-authored-by: Jerry <jerrycgh@gmail.com>

Author: while0x1

pycardano/backend/blockfrost.py

@@ -174,9 +174,10 @@ def protocol_param(self) -> ProtocolParameters:
 
     def _get_script(self, script_hash: str) -> ScriptType:
         script_type = self.api.script(script_hash).type
-        if script_type.startsWith("plutusV"):
+        if script_type.startswith("plutusV"):
             ps = PlutusScript.from_version(
-                script_type[-1], bytes.fromhex(self.api.script_cbor(script_hash).cbor)
+                int(script_type[-1]),
+                bytes.fromhex(self.api.script_cbor(script_hash).cbor),
             )
             return _try_fix_script(script_hash, ps)
         else: