Update erigon3 v3.3.5 -> v3.3.7, dshackle 0.75.3 -> 0.75.4

- Erigon3 for ethereum, gnosis, linea: v3.3.5 -> v3.3.7
- Dshackle: 0.75.3 -> 0.75.4

Co-Authored-By: Claude Agent <claude@stakesquid.eu>

drpc-free.yml

@@ -1,6 +1,6 @@
 services:
   dshackle-free:
-    image: drpcorg/dshackle:0.75.3
+    image: drpcorg/dshackle:0.75.4
     restart: unless-stopped
     volumes:
       - ./free_configs:/etc/dshackle