hackage-security: file returned by server too large

*Originally reported here: https://github.com/commercialhaskell/stack/issues/5770*

I have been seeing this error more and more often:
```
Selected mirror https://hackage.haskell.org/
Downloading root
Waiting to acquire cache lock on /home/runner/.stack/pantry/hackage/hackage-security-lock
Acquired cache lock on /home/runner/.stack/pantry/hackage/hackage-security-lock
Released cache lock on /home/runner/.stack/pantry/hackage/hackage-security-lock
Selected mirror https://hackage.haskell.org/
Downloading timestamp
Downloading snapshot
Downloading mirrors
Cannot update index (no local copy)
Downloading index
file returned by server too large: /01-index.tar.gz (expected exactly 115606991 bytes)
```

It started to occur yesterday, and today I have seen it a couple of times. In this CI [run](https://github.com/tweag/rules_haskell/actions/runs/5753152792/job/15595735527?pr=1921) almost all jobs are failing because of it.