chore: extend the default block_proposal_timeout to 4 hours

Until #5729 is implemented, then there is no point in rejecting a block
from a miner, no matter how late it is, since no other miner will ever
try to extend into its tenure.

Fixes #5753

stacks-signer/CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to the versioning scheme outlined in the [README.md](README.md).
 
+## [Unreleased]
+
+### Changed
+
+- Increase default `block_proposal_timeout_ms` from 10 minutes to 4 hours. Until #5729 is implemented, there is no value in rejecting a late block from a miner, since a late block is better than no block at all.
+
 ## [3.1.0.0.4.0]
 
 ## Added

stacks-signer/src/config.rs

@@ -35,7 +35,7 @@ use stacks_common::util::hash::Hash160;
 use crate::client::SignerSlotID;
 
 const EVENT_TIMEOUT_MS: u64 = 5000;
-const BLOCK_PROPOSAL_TIMEOUT_MS: u64 = 600_000;
+const BLOCK_PROPOSAL_TIMEOUT_MS: u64 = 14_400_000;
 const BLOCK_PROPOSAL_VALIDATION_TIMEOUT_MS: u64 = 120_000;
 const DEFAULT_FIRST_PROPOSAL_BURN_BLOCK_TIMING_SECS: u64 = 60;
 const DEFAULT_TENURE_LAST_BLOCK_PROPOSAL_TIMEOUT_SECS: u64 = 30;