chore: update versions

[horsefacts]

Motivation

We're using placeholder version strings.

Change Summary

Update version strings to 2023.08.23.

Merge Checklist

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

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

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PR-Codex overview

Focus of the PR:

Update contract versions to "2023.08.23" in various contracts.

Detailed summary:

• StorageRegistry.sol: Update VERSION constant to "2023.08.23".
• FnameResolver.sol: Update VERSION constant to "2023.08.23".
• KeyRegistry.sol: Update VERSION constant to "2023.08.23".
• SignedKeyRequestValidator.sol: Update VERSION constant to "2023.08.23".
• IdRegistry.sol: Update VERSION constant to "2023.08.23".
• Bundler.sol: Update VERSION constant to "2023.08.23".
• StorageRegistry.t.sol: Update testVersion function to assert VERSION as "2023.08.23".
• Bundler.t.sol: Add testVersion function to assert VERSION as "2023.08.23".
• KeyRegistry.t.sol: Add testVersion function to assert VERSION as "2023.08.23".
• FnameResolver.t.sol: Add testVersion function to assert VERSION as "2023.08.23".
• SignedKeyRequestValidator.t.sol: Add testVersion function to assert VERSION as "2023.08.23".
• IdRegistry.t.sol: Add testVersion function to assert VERSION as "2023.08.23".

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[github-actions[bot]]

Coverage after merging horsefacts/update-versions into main will be

98.65%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
Bundler.sol	100%	100%	100%	100%
FnameResolver.sol	100%	100%	100%	100%
IdRegistry.sol	100%	100%	100%	100%
KeyRegistry.sol	100%	100%	100%	100%
StorageRegistry.sol	100%	100%	100%	100%
src/lib
EIP712.sol	50%	100%	50%	50%	19
Signatures.sol	100%	100%	100%	100%
TransferHelper.sol	0%	0%	0%	0%	12, 17, 20, 20, 20
TrustedCaller.sol	100%	100%	100%	100%
src/validators
SignedKeyRequestValidator.sol	100%	100%	100%	100%