gnutls: update to 3.7.7

- libgnutls: Fixed double free during verification of pkcs7 signatures.
  Reported by Jaak Ristioja (#1383). [GNUTLS-SA-2022-07-07, CVSS: medium]
  [CVE-2022-2509]

- libgnutls: gnutls_hkdf_expand now only accepts LENGTH argument less than or
  equal to 255 times hash digest size, to comply with RFC 5869 2.3.

- libgnutls: Length limit for TLS PSK usernames has been increased
  from 128 to 65535 characters (#1323).

- libgnutls: AES-GCM encryption function now limits plaintext
  length to 2^39-256 bits, according to SP800-38D 5.2.1.1.

- libgnutls: New block cipher functions have been added to transparently
  handle padding.  gnutls_cipher_encrypt3 and gnutls_cipher_decrypt3 can be
  used in combination of GNUTLS_CIPHER_PADDING_PKCS7 flag to automatically
  add/remove padding if the length of the original plaintext is not a multiple
  of the block size.

- libgnutls: New function for manual FIPS self-testing.

API and ABI modifications:
- gnutls_fips140_run_self_tests: New function
- gnutls_cipher_encrypt3: New function
- gnutls_cipher_decrypt3: New function
- gnutls_cipher_padding_flags_t: New enum

Signed-off-by: Nick Hainke <vincent@systemli.org>

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