chore: upgrade solc to 0.8.29

[horsefacts]

Motivation

We haven't touched the contracts in over a year and solc is out of date.

Change Summary

• Relax version pragmas for deployed contracts
• Update solc to 0.8.29

Merge Checklist

Choose all relevant options below by adding an x now or at any time before submitting for review

• The PR title adheres to the conventional commits standard
• The PR has been tagged with change type label(s) (i.e. documentation, feature, bugfix, or chore)
• The PR's changes adhere to all the requirements in the contribution guidelines
• All commits have been signed

---

PR-Codex overview

This PR updates the pragma solidity version across multiple files to allow for compatibility with newer Solidity versions. It also updates the solc_version and evm_version in the foundry.toml file.

Detailed summary

• Updated pragma solidity from 0.8.21 to ^0.8.21 in various files.
• Updated solc_version from 0.8.21 to 0.8.29 in foundry.toml.
• Updated evm_version from paris to cancun in foundry.toml.
• Updated pragma solidity in src/TierRegistry.sol from 0.8.21 to 0.8.29.

The following files were skipped due to too many changes: .gas-snapshot

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[github-actions]

Coverage after merging horsefacts/solidity-version-upgrade into main will be

100.00%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
Bundler.sol	100%	100%	100%	100%
BundlerV1.sol	100%	100%	100%	100%
FnameResolver.sol	100%	100%	100%	100%
IdGateway.sol	100%	100%	100%	100%
IdRegistry.sol	100%	100%	100%	100%
KeyGateway.sol	100%	100%	100%	100%
KeyRegistry.sol	100%	100%	100%	100%
RecoveryProxy.sol	100%	100%	100%	100%
StorageRegistry.sol	100%	100%	100%	100%
TierRegistry.sol	100%	100%	100%	100%
src/abstract
EIP712.sol	100%	100%	100%	100%
Guardians.sol	100%	100%	100%	100%
Migration.sol	100%	100%	100%	100%
Nonces.sol	100%	100%	100%	100%
Signatures.sol	100%	100%	100%	100%
src/validators
SignedKeyRequestValidator.sol	100%	100%	100%	100%