Minor fixes for VCert e2e inorder to work with latests images

[luispresuelVenafi]

• Adds legacy support for PKCS12. E2E tests don't work on newer docker images because of new Open SSL that dropped support by default, adding flag to restore the support). This fixes:

  vcert enroll -u '' -k **** -z 'redacted'  -cn 1my-test.example.com -format pkcs12 -file all.p12 -key-password ****
  openssl pkcs12 -in "all.p12" -passin pass:*** -noout
  Error outputting keys and certificates
  40A71564917F0000:error:0308010C:digital envelope routines:inner_evp_generic_fetch:unsupported:../crypto/evp/evp_fetch.c:373:Global default library context, Algorithm (RC2-40-CBC : 0), Properties ()

• Constrain Ruby image version to ruby:3.2. This is so we don't get any surprise eventually due issue mentioned happened above.