Bug: Can't overwrite expired public key

I do not store my private key with keybase nor do I ever want to. I also do not desire to have any clients of keybase locally.

# Problem

My public key on keybase is expired. I have extended my key expiration for a year. Keybase blocks me updating my expired key with a new key (exact same key ID). This has been a problem for over 1 year but I am only now reporting it. I searched the issue history and found a similar issue from another user but it is old.

Error message:

```
Error in your post
-------------------

Code: 905
Name: KEY_CORRUPTED
Description: no valid primary key self-signature or key(s) have expired (Signature failure in packet 1: rejecting insecure hash SHA1 (8d8bf0e242d8a068572ebf3ce8f732347257e65f))
```

Keybase should not be trying to verify signatures with an expired key ESPECIALLY if what the user is trying to update is a new (non-expired) version of that same key.

# My user information

Username: https://keybase.io/samrocketman

New public key (click to expand)

---

```
-----BEGIN PGP PUBLIC KEY BLOCK-----

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=wZAe
-----END PGP PUBLIC KEY BLOCK-----
```

---

Here's proof that I own the private key via this signed statement.

Signed statement proving I own the GPG private key (click to expand)

---

```
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

I am Sam Gleske and I certify this is my public key. This certification only
applies to [the following GitHub issue][1]. This signed statement is to prove
I own the public key in question.

My keybase user is [samrocketman][2].

I have temporarily uploaded my public key to a [GitHub repository][3].

My GPG key ID: 8D8BF0E242D8A068572EBF3CE8F732347257E65F

[1]: https://github.com/keybase/keybase-issues/issues/4075
[2]: https://keybase.io/samrocketman
[3]: https://github.com/samrocketman/gpg

-----BEGIN PGP SIGNATURE-----

iQIzBAEBCgAdFiEEjYvw4kLYoGhXLr886PcyNHJX5l8FAmGL4qsACgkQ6PcyNHJX
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zNRaqpo9l0mkYFf889jEn0u+FT/7er6uZ74Em2fpZkfkSSWI7TI=
=3vW3
-----END PGP SIGNATURE-----
```

---

Start by tracing the public-key upload path that produces Code 905 and the KEY_CORRUPTED description; the issue does not name a source file, test, or entry point. Done means an extended, non-expired version of an expired key with the same key ID can be uploaded without rejection, while signature validation remains correct.

Written by the indexing model from the issue text.