WIP: community/nomad: upgrade to 1.2.3

• https://github.com/hashicorp/nomad/releases/tag/v1.1.2
• https://github.com/hashicorp/nomad/releases/tag/v1.1.3
• https://github.com/hashicorp/nomad/releases/tag/v1.1.4 CVE-2021-37218
• https://github.com/hashicorp/nomad/releases/tag/v1.1.5
• https://github.com/hashicorp/nomad/releases/tag/v1.1.6
• ..
• https://github.com/hashicorp/nomad/releases/tag/v1.2.1 CVE-2021-43415
• https://github.com/hashicorp/nomad/releases/tag/v1.2.2
• https://github.com/hashicorp/nomad/releases/tag/v1.2.3 CVE-2021-44717