fix: use native blake2b compression function IFF blake2b-py not install

Author: fubuloubu

eth/precompiles/blake2.py

@@ -1,4 +1,3 @@
-import blake2b
 from eth_utils import (
     ValidationError,
 )
@@ -11,6 +10,11 @@
     BaseComputation,
 )
 
+try:
+    from blake2b import compress as blake2b_compress
+except ModuleNotFoundError:
+    from eth._utils.blake2.compression import blake2b_compress
+
 GAS_COST_PER_ROUND = 1
 
 
@@ -25,5 +29,5 @@ def blake2b_fcompress(computation: BaseComputation) -> BaseComputation:
 
     computation.consume_gas(gas_cost, reason=f"Blake2b Compress Precompile w/ {num_rounds} rounds")
 
-    computation.output = blake2b.compress(*parameters)
+    computation.output = blake2b_compress(*parameters)
     return computation