Update dependency grpcio to v1.78.0

Author: renovate[bot]

requirements.txt

@@ -2,6 +2,6 @@ homeassistant==2024.12.5
 aiodiscover==2.1.0
 pyspeex-noise==1.0.2
 opentelemetry-sdk==1.29.0
-grpcio==1.70.0
+grpcio==1.78.0
 opentelemetry-exporter-otlp-proto-http==1.29.0
 opentelemetry-exporter-otlp-proto-grpc==1.29.0