fix: broken documentation URLs in link checker

1. remote_mining.rs: dicle.subscan.io -> explorer.pezkuwichain.io
   - subscan doesn't have our testnet, use our explorer

2. ethereum-client + beacon primitives: consensus-specs/blob/dev -> blob/master
   - ethereum repo uses 'master' branch, not 'dev'
   - 5 URLs updated

pezbridges/pezsnowbridge/primitives/beacon/src/merkle_proof.rs

@@ -4,7 +4,7 @@ use pezsp_core::H256;
 use pezsp_io::hashing::sha2_256;
 
 /// Specified by <https://github.com/ethereum/consensus-specs/blob/fe9c1a8cbf0c2da8a4f349efdcd77dd7ac8445c4/specs/phase0/beacon-chain.md?plain=1#L742>
-/// with improvements from <https://github.com/ethereum/consensus-specs/blob/dev/ssz/merkle-proofs.md>
+/// with improvements from <https://github.com/ethereum/consensus-specs/blob/master/ssz/merkle-proofs.md>
 pub fn verify_merkle_branch(
 	leaf: H256,
 	branch: &[H256],

pezbridges/pezsnowbridge/primitives/beacon/src/types.rs

@@ -640,7 +640,7 @@ pub mod deneb {
 	use serde::{Deserialize, Serialize};
 
 	/// ExecutionPayloadHeader
-	/// <https://github.com/ethereum/consensus-specs/blob/dev/specs/deneb/beacon-chain.md#executionpayloadheader>
+	/// <https://github.com/ethereum/consensus-specs/blob/master/specs/deneb/beacon-chain.md#executionpayloadheader>
 	#[derive(
 		Default,
 		Encode,