Removed year from license headers

[PierreOssun]

Pull Request Summary

Removed license from headers

Close #1189

[github-actions]

Package	Line Rate	Branch Rate	Health
primitives/src	61%	0%	➖
pallets/static-price-provider/src	52%	0%	➖
pallets/dapp-staking-migration/src	0%	0%	❌
pallets/oracle-benchmarks/src	0%	0%	❌
pallets/xc-asset-config/src	64%	0%	➖
precompiles/xvm/src	75%	0%	➖
chain-extensions/types/unified-accounts/src	0%	0%	❌
pallets/price-aggregator/src	72%	0%	➖
pallets/astar-xcm-benchmarks/src	88%	0%	✔
pallets/unified-accounts/src	86%	0%	✔
pallets/dapp-staking-v3/src	91%	0%	✔
pallets/dapp-staking-v3/src/test	0%	0%	❌
pallets/dapp-staking-v3/src/benchmarking	99%	0%	✔
chain-extensions/types/assets/src	0%	0%	❌
precompiles/dapp-staking-v3/src	90%	0%	✔
precompiles/sr25519/src	64%	0%	➖
pallets/dynamic-evm-base-fee/src	92%	0%	✔
precompiles/dapp-staking-v3/src/test	0%	0%	❌
pallets/xvm/src	54%	0%	➖
pallets/dapp-staking-v3/rpc/runtime-api/src	0%	0%	❌
pallets/inflation/src	83%	0%	✔
precompiles/unified-accounts/src	100%	0%	✔
chain-extensions/pallet-assets/src	56%	0%	➖
chain-extensions/types/xvm/src	0%	0%	❌
pallets/ethereum-checked/src	79%	0%	➖
chain-extensions/unified-accounts/src	0%	0%	❌
precompiles/assets-erc20/src	81%	0%	✔
precompiles/substrate-ecdsa/src	74%	0%	➖
primitives/src/xcm	64%	0%	➖
pallets/astar-xcm-benchmarks/src/fungible	100%	0%	✔
pallets/collator-selection/src	92%	0%	✔
chain-extensions/xvm/src	0%	0%	❌
pallets/astar-xcm-benchmarks/src/generic	100%	0%	✔
precompiles/xcm/src	73%	0%	➖
precompiles/dispatch-lockdrop/src	86%	0%	✔
Summary	78% (3592 / 4630)	0% (0 / 0)	➖

Minimum allowed line rate is 50%

[Dinonard]

Great!