fix: cache bust on http checksum failure

[dsherret]

This attempts to cache bust the remote specifier on checksum failure. This is useful in the following scenario:

1. User downloads a remote module from esm.sh to their local cache
2. esm.sh changes their code
3. Another dev updates the lockfile in the repo
4. User pulls in the new lockfile and attempts running their code, only to get an error (with this change, it now pulls it in)

[bartlomieju]

Nice!