openssl: bump to 1.1.1u

openssl: bump to 1.1.1u

Major changes between OpenSSL 1.1.1t and OpenSSL 1.1.1u [30 May 2023]

    o Mitigate for very slow `OBJ_obj2txt()` performance with gigantic
      OBJECT IDENTIFIER sub-identities.  (CVE-2023-2650)
    o Fixed documentation of X509_VERIFY_PARAM_add0_policy() (CVE-2023-0466)
    o Fixed handling of invalid certificate policies in leaf certificates
      (CVE-2023-0465)
    o Limited the number of nodes created in a policy tree ([CVE-2023-0464])

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>