verify_checksum: -5 (probably not tlcontrib this time)

[John Coughlin]

I am getting an error on many tlmgr operations. For example,

> $ tlmgr update --list
> 
> /Library/TeX/texbin/tlmgr: unexpected return value from verify_checksum: -5

The same error occurs on 

$ tlmgr update --self
$ tlmgr install <package>
etc.

The only info I could find was this thread <https://tug.org/pipermail/tex-live/2020-February/044766.html> from February, which suggests that the error is connected to the public key for the tlcontrib repository being expired. However, I have never interacted with tlcontrib or other repositories than main:

> $ tlmgr repository list
> List of repositories (with tags if set):
> http://mirror.ctan.org/systems/texlive/tlnet (main)

Any suggestions?

Thank you,
-Jack
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