py-asn1crypto: updated to 0.24.0

0.24.0
- `x509.Certificate().self_signed` will no longer return `"yes"` under any
  circumstances. This helps prevent confusion since the library does not
  verify the signature. Instead a library like oscrypto should be used
  to confirm if a certificate is self-signed.
- Added various OIDs to `x509.KeyPurposeId()`
- Added `x509.Certificate().private_key_usage_period_value`
- Added structures for parsing common subject directory attributes for
  X.509 certificates, including `x509.SubjectDirectoryAttribute()`
- Added `algos.AnyAlgorithmIdentifier()` for situations where an
  algorithm identifier may contain a digest, signed digest or encryption
  algorithm OID
- Fixed a bug with `x509.Certificate().subject_directory_attributes_value`
  not returning the correct value
- Fixed a bug where explicitly-tagged fields in a `core.Sequence()` would
  not function properly when the field had a default value
- Fixed a bug with type checking in `pem.armor()`


(adam)