Lock pragma version for `L*BitcoinDepositor` contracts (#806) #5260

Job	Run time
contracts-detect-changes	3s
contracts-build-and-test	3m 59s
contracts-format	1m 57s
contracts-deployment-dry-run	1m 38s
contracts-slither	2m 15s
contracts-deployment-testnet	0s
contracts-dapp-development-deployment-testnet	0s
contracts-etherscan-verification	0s
	9m 52s

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