fix: Update RPC URLs for Ethereum and Arbitrum Sepolia configurations

Author: gfournierPro

.env.template

@@ -1,12 +1,12 @@
 # Ethereum Sepolia Configuration
-SEPOLIA_RPC_URL=https://rpc.sepolia.org
+SEPOLIA_RPC_URL="https://gateway.tenderly.co/public/sepolia"
 SEPOLIA_ENDPOINT_ADDRESS=0x<layerzero-endpoint-address-on-sepolia>
 SEPOLIA_CHAIN_ID=SEPOLIA_CHAIN_ID=40161  # LayerZero chain ID for Ethereum Sepolia
 SEPOLIA_ADAPTER_ADDRESS=0x<deployed-rlc-adapter-address-on-sepolia>
 RLC_SEPOLIA_ADDRESS=0x<rlc-token-address-on-sepolia>
 
 # Arbitrum Sepolia Configuration
-ARBITRUM_SEPOLIA_RPC_URL=https://sepolia-rollup.arbitrum.io/rpc
+ARBITRUM_SEPOLIA_RPC_URL="https://arbitrum-sepolia-rpc.publicnode.com"
 ARBITRUM_SEPOLIA_ENDPOINT_ADDRESS=0x<layerzero-endpoint-address-on-arbitrum-sepolia>
 ARBITRUM_SEPOLIA_CHAIN_ID=40231  # LayerZero chain ID for Arbitrum Sepolia
 ARBITRUM_SEPOLIA_OFT_ADDRESS=0x<deployed-rlcoft-address-on-arbitrum-sepolia>