Add UDFs for 3.11 and 3.12.

wiki/src/upgrade/v1/Tails/3.11/amd64/alpha/upgrades.yml

+---
+build-target: amd64
+channel: alpha
+product-name: Tails
+product-version: '3.11'

wiki/src/upgrade/v1/Tails/3.11/amd64/alpha/upgrades.yml.pgp

+-----BEGIN PGP SIGNATURE-----
+
+iHUEABYKAB0WIQTNTUNRr6aTP1dKmvuQsrS9eu0jXwUCW3cDQgAKCRCQsrS9eu0j
+Xx/uAP4/cn+sGG6Tu0FxjfjF02aAXo0pRMiMe8ZJoXzy4w5lAAEAhEgyRZ4gFElB
+/hMGj1a+aT4FMZNKM+cCz3g2Rd7kkAA=
+=pNyo
+-----END PGP SIGNATURE-----

wiki/src/upgrade/v1/Tails/3.11/amd64/stable/upgrades.yml

+---
+build-target: amd64
+channel: stable
+product-name: Tails
+product-version: '3.11'

wiki/src/upgrade/v1/Tails/3.11/amd64/stable/upgrades.yml.pgp

+-----BEGIN PGP SIGNATURE-----
+
+iHUEABYKAB0WIQTNTUNRr6aTP1dKmvuQsrS9eu0jXwUCW3cDPAAKCRCQsrS9eu0j
+X/3rAP92fdTfouSpGrF59ibaGw5YmSLSMKGEgFMiYD0z0ccKmwD6A2WueZCHFcdz
+Q9IuoToRQUcnGX7u+racvw7RJ2dApQk=
+=n59j
+-----END PGP SIGNATURE-----

wiki/src/upgrade/v1/Tails/3.12/amd64/alpha/upgrades.yml

+---
+build-target: amd64
+channel: alpha
+product-name: Tails
+product-version: '3.12'

wiki/src/upgrade/v1/Tails/3.12/amd64/alpha/upgrades.yml.pgp

+-----BEGIN PGP SIGNATURE-----
+
+iHUEABYKAB0WIQTNTUNRr6aTP1dKmvuQsrS9eu0jXwUCW3cDTAAKCRCQsrS9eu0j
+XxknAP4xIS2GdAafE0AjlVEyXm2BpO/5VDwvMTXtRkkz//w5SgEAn+H0Kq8kSeNR
+o4cWBv5k1VAC0O3MxJ9q6lV6nYzd9wk=
+=ESpR
+-----END PGP SIGNATURE-----

wiki/src/upgrade/v1/Tails/3.12/amd64/stable/upgrades.yml

+---
+build-target: amd64
+channel: stable
+product-name: Tails
+product-version: '3.12'

wiki/src/upgrade/v1/Tails/3.12/amd64/stable/upgrades.yml.pgp

+-----BEGIN PGP SIGNATURE-----
+
+iHUEABYKAB0WIQTNTUNRr6aTP1dKmvuQsrS9eu0jXwUCW3cDRwAKCRCQsrS9eu0j
+X2ihAP9fC+1AC/9ZlJQFu4hx43/pSqJl6+k6uKt6uBbvDxijkAD6A/NMS+4ywMJz
+EE8KEqyxad3N0BwOlCI4EkgTHdSoyQ4=
+=3qIl
+-----END PGP SIGNATURE-----