pin bee to 2.7.2-rc1 (same as the working remote node)

2.7.1 and 2.8.0 both get rejected by the mainnet bootnodes with
"protocols not supported: [/swarm/handshake/14.0.0/handshake]".
2.7.2-rc1 is the version bee.ffaerber.duckdns.org runs with 25 live
peers, so try that.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

hostinger/prod-stack.yaml

@@ -192,10 +192,11 @@ services:
 
 
   bee:
-    # Pinned to 2.7.1: Bee 2.8 ships handshake protocol v14 which the live
-    # mainnet bootnodes don't negotiate yet — node ends up isolated. Revisit
-    # when the network upgrades.
-    image: ethersphere/bee:2.7.1
+    # Pinned to 2.7.2-rc1 — same version the working remote node at
+    # bee.ffaerber.duckdns.org runs (25 live peers). 2.7.1 + 2.8.0 hit a
+    # `/swarm/handshake/14.0.0/handshake` protocol mismatch against the live
+    # mainnet bootnodes.
+    image: ethersphere/bee:2.7.2-rc1
     # NOTE: BEE_BLOCKCHAIN_RPC_ENDPOINT is silently ignored by Bee 2.8 — pass
     # the flag explicitly. Without it Bee logs "chain backend disabled" and
     # exits with "factory fail: chain disabled".