Add retry logic for foundryup

thanks @mds1 that's a good point

Looking at the error message, it might also be https://github.com/foundry-rs/foundry/issues/3942 (which would explain why the tests are passing in @pcaversaccio CI).

@elopez : maybe we can update the commit used for foundryup, and if installing foundry fails, we do a `sleep` for 1-2 second, and try again?

_Originally posted by @montyly in https://github.com/crytic/slither-action/issues/66#issuecomment-1919559648_