cert-manager-webhook-cern: Bump to 0.2.2

To use leverage fixes for clusterissuer:

• https://gitlab.cern.ch/kubernetes/security/cert-manager-webhook-cern/-/commit/64b3d29017092d246beb8f3f5966997f180e0329
• https://gitlab.cern.ch/kubernetes/security/cert-manager-webhook-cern/-/commit/2dbf2edfdd8487c9b2d25cc0ad5dc639f9aa0f68