chore(repo): year update in the LICENSE file

[1uckyjack]

Year update in the LICENSE file:
The current LICENSE file contains the copyright for 2021. As far as I know, a new and more up-to-date version has been released. I am updating a small PR to update the year for 2023.

zkevm-circuits/mock/Cargo.toml

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license = "MIT OR Apache-2.0"

zkevm-circuits/gadgets/Cargo.toml

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license = "MIT OR Apache-2.0"

zkevm-circuits/geth-utils/Cargo.toml

Line 5 in 7f750aa

license = "MIT OR Apache-2.0"

zkevm-circuits/bus-mapping/Cargo.toml

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license = "MIT OR Apache-2.0"

zkevm-circuits/external-tracer/Cargo.toml

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license = "MIT OR Apache-2.0"

zkevm-circuits/keccak256/Cargo.toml

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license = "MIT OR Apache-2.0"

zkevm-circuits/circuit-benchmarks/Cargo.toml

Line 5 in 7f750aa

license = "MIT OR Apache-2.0"

zkevm-circuits/zkevm-circuits/Cargo.toml

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license = "MIT OR Apache-2.0"

zkevm-circuits/eth-types/Cargo.toml

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license = "MIT OR Apache-2.0"

zkevm-circuits/integration-tests/Cargo.toml

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license = "MIT OR Apache-2.0"