Update DutchAuction.sol

[sadityakumar9211]

Description

Optimised the smart contract using the custom error with revert statements. This significantly reduces the gas cost in smart contract transactions. Give a summary of the change that you have made
I have modified the smart contract to use custom error with revert statements rather than using require statement with error strings which is significantly expensive compared to the former.

Developer's checklist

• [x] My PR follows the style guidelines of this project
• [x] I have performed a self-check on my work

If changes are made in the code:

• [x] I have followed the coding guidelines
• [x] My changes in code generate no new warnings
• [ ] My changes are breaking another fix/feature of the project
• [ ] I have added test cases to show that my feature works
• [ ] I have added relevant screenshots in my PR

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PR is not linked to any issue, please make the corresponding changes in the body.

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PR is not linked to any issue, please make the corresponding changes in the body.

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PR is not linked to any issue, please make the corresponding changes in the body.