fix base multicall multichunk for gas

[jsy1218]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Bug fix

• What is the current behavior? (You can also link to an open issue here)
  Base mainnet integ-tests are failing due to gas https://app.warp.dev/block/tCQ8sTuuw42vtQjttnDlAE.

• What is the new behavior (if this is a feature change)?
  Reduce Base multichunk so swap integ-tests aren't failing anymore. https://app.warp.dev/block/qBFFXAPgnzIsqjX4atI7Pd

• Other information:
  Not sure when we started to see BASE gas failures. But it might impact prod, as we started seeing the gas error metrics recently:

The timeline doesn't really match, but we could keep an eye out.

[mikeki]

We should also update the routing-api config if this config works better

[jsy1218]

We should also update the routing-api config if this config works better

I just realized that we don't override BASE gas params in routing-api 😅 https://github.com/Uniswap/routing-api/blob/main/lib/handlers/injector-sor.ts#L177-L246