ldap: Use hashed passwords in the test

Dependencies

• [2] B22SQY65 LDAP add test for roles and multiple users
• [3] A4NSGFS3 LDAP: add VM test to flake.nix
• [*] RWNXH3H2 lastModified -> lastModifiedDate

Change contents

• edit in flake.nix at line 369
  [3.508]

  [3.508]
  + extraConfig = ''

  + moduleload pw-sha2

  + '';
• edit in flake.nix at line 375
  [3.570]

  [3.570]
  + # userPassword generated via `slappasswd -o module-load=pw-sha2 -h '{SSHA256}'`

  + # The admin user has the password `password and `user` has the password `foobar`.
• replacement in flake.nix at line 409
  [3.1255]→[3.1255:1294](∅→∅)
  − userPassword: foobar
  [3.1255]

  [2.447]
  + userPassword: {SSHA256}B9rfUbNgv8nIGn1Hm5qbVQdv6AIQb012ORJwegqELB0DWCzoMCY+4A==
• replacement in flake.nix at line 417
  [2.690]→[2.690:731](∅→∅)
  − userPassword: password
  [2.690]

  [3.1294]
  + userPassword: {SSHA256}meKP7fSWhkzXFC1f8RWRb8V8ssmN/VQJp7xJrUFFcNUDuwP1PbitMg==