Add new WETH9 token address for chain ID 8453 (BASE)

[codeesura]

Summary:

This PR adds support for the WETH9 token address associated with chain ID 8453.

Changes:

Added a new key-value pair to the WETH9 mapping for chain ID 8453.

[stale[bot]]

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[hensha256]

done in #90 along with some other chains!