Too bad that the packages are not in the debian 11 repositories.
They are in backports.
aaron@omv6dev:~$ apt-cache policy swtpm swtpm-tools
swtpm:
Installed: (none)
Candidate: 0.7.1~bpo11+1
Version table:
0.7.1-1~bpo11+1 100
100 http://httpredir.debian.org/debian bullseye-backports/main amd64 Packages
0.7.1~bpo11+1 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages
0.7.0~rc1+2 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages
0.7.0~rc1+1 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages
0.6.99+1 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages
swtpm-tools:
Installed: (none)
Candidate: 0.7.1~bpo11+1
Version table:
0.7.1-1~bpo11+1 100
100 http://httpredir.debian.org/debian bullseye-backports/main amd64 Packages
0.7.1~bpo11+1 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages
0.7.0~rc1+2 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages
0.7.0~rc1+1 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages
0.6.99+1 500
500 http://download.proxmox.com/debian/pve bullseye/pve-no-subscription amd64 Packages