Update versions: erigon3 v3.3.5, nimbus v26.1.0, bor 2.5.8, dshackle 0.75.3

- erigon3: v3.3.4 -> v3.3.5 (ethereum, gnosis)
- nimbus: multiarch-v25.12.0 -> multiarch-v26.1.0 (ethereum consensus)
- bor: 2.5.7 -> 2.5.8 (polygon)
- dshackle: 0.75.1 -> 0.75.3

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

drpc-free.yml

@@ -1,6 +1,6 @@
 services:
   dshackle-free:
-    image: drpcorg/dshackle:0.75.1
+    image: drpcorg/dshackle:0.75.3
     restart: unless-stopped
     volumes:
       - ./free_configs:/etc/dshackle