Erigon v3.5.4 Fixes RPC Gzip Memory Leak

Erigon v3.5.4 fixes RPC gzip native-memory leak. Archive nodes lost ~9-15 GiB/day. libdeflate.Compressor pooling failed to Close() GC-evicted entries. Replaced with bounded channel pool. Drop-in upgrade from 3.5.3, no re-sync. Also expands ~/ and $VAR in --datadir for cobra binaries. Updates grpc to v1.82.1.