✨ Add overrideable _versionHash to ERC20

[Vectorized]

Description

In case for some reason, a version other than "1" is needed.

Checklist

Ensure you completed all of the steps below before submitting your pull request:

• Ran forge fmt?
• Ran forge test?

Pull requests with an incomplete checklist will be thrown out.

[github-actions]

Gas Snapshot Comparison Report

Generated at commit : 8f92b50, Compared to commit : 5b49c64

Contract Name	Test Name	Main Gas	PR Gas	Diff
CREATE3Test	testDeployERC20()	780674	781227	553
	testDoubleDeployDifferentBytecodeReverts()	96898724	96898738	14
	test__codesize()	13856	13860	4
ERC20ForPermit2Test	test__codesize()	8965	8967	2
ERC20Invariants	test__codesize()	7276	7278	2
ERC20Test	testPermit()	89369	89379	10
	test__codesize()	22606	22608	2
ERC4626Test	testTryGetAssetDecimals()	30674026	30687274	13248
	testUseVirtualShares()	2426848	2427648	800
	testVirtualSharesMultipleMintDepositRedeemWithdraw()	1614279	1614679	400
	test__codesize()	36899	36903	4
LifebuoyTest	test__codesize()	45951	45953	2
SafeTransferLibTest	testApproveWithRetry()	789340	789740	400
	testPermit2()	90097	90112	15
	testTransferFromWithMissingReturn()	542513	542551	38
	testTransferFromWithReturnsFalseReverts()	508851	508931	80
	testTransferFromWithReturnsTooLittleReverts()	508583	508642	59
	testTransferFromWithReturnsTooMuch()	543405	543464	59
	testTransferFromWithRevertingReverts()	501317	501397	80
	testTransferWithMissingReturn()	529120	529179	59
	testTransferWithReturnsTooLittleReverts()	505564	505585	21
	testTransferWithRevertingReverts()	776726	776822	96
	testTransferWithStandardERC20()	530015	530079	64
	test__codesize()	65977	65981	4
WETHInvariants	test__codesize()	5176	5178	2
WETHTest	test__codesize()	9408	9410	2