Update root.json for 2023

The expiration has been pushed out by one year, rather than two,
pending procedural reforms to increase the robustness of this process.

This time, two additional mirror keys have been added to increase
redudancy: Gershom Bazerman's root key is now empowered to sign
mirrors.json, and David Thrane Christiansen has generated a fresh
mirror-signing key.

Author: david-christiansen

operational-keys/mirror-christiansen.public

@@ -0,0 +1 @@
+{"keytype":"ed25519","keyval":{"public":"m/y6qGlVTmG9i51hfz5ebhenP82vM6oYokkQsj8Pcx4="}}

operational-keys/mirror-christiansen.public.sig

@@ -1,24 +1,24 @@
 {
   "signatures": [
     {
-      "keyid": "51f0161b906011b52c6613376b1ae937670da69322113a246a09f807c62f6921",
+      "keyid": "1ea9ba32c526d1cc91ab5e5bd364ec5e9e8cb67179a471872f6e26f0ae773d42",
       "method": "ed25519",
-      "sig": "AqRKpnmVj7VC04bxYun9G12EqzlOuLR4ugxD2fuo4kCN94+ps+gSU3f0Geiy8BvI7jWEKJlxzx2kR7tGeEcZCQ=="
+      "sig": "XcDelEzx7I1cYJ/VU/KtoqJbQw4kS9yQydnRjfE/iQkw8wWWWMeA06p2aPdgMj5BjjIJUpfIYOgcg3KxuzabBQ=="
     },
     {
       "keyid": "fe331502606802feac15e514d9b9ea83fee8b6ffef71335479a2e68d84adc6b0",
       "method": "ed25519",
-      "sig": "Xo/6i0MTGMmuh7w1BZtiluTN6lXyUSwx0L2QqO61dH/MsX9CstJt9g2sgwONtn0qgINlVuE3SUzPv4G1jzRSBA=="
+      "sig": "u2lFlq8Qu8kZiP2iyOFB5fWG62mP21g8aEduBGAowh05vwO+YDK8UOO8+zUXSyZ+55z+xwi4UFF2N3gHc/eQCA=="
     },
     {
       "keyid": "0a5c7ea47cd1b15f01f5f51a33adda7e655bc0f0b0615baa8e271f4c3351e21d",
       "method": "ed25519",
-      "sig": "No8d1pubIqrZTWzWb9gj/kAKp8qjvhEcKd7FWE8yUUxr46+CGyBJ/7VjhPvaA2sWCxNnvl+62li5HpPmFvwqDQ=="
+      "sig": "zKsfttWj6sD8DWbTgybCvdhc5YBJJUV9r0sq9VBubrZJ9F26NbTG/t8SqkTYFt452gYjEyhXvY28lmacO0YbDg=="
     }
   ],
   "signed": {
     "_type": "Root",
-    "expires": "2022-07-31T23:59:59Z",
+    "expires": "2023-07-31T23:59:59Z",
     "keys": {
       "0a5c7ea47cd1b15f01f5f51a33adda7e655bc0f0b0615baa8e271f4c3351e21d": {
         "keytype": "ed25519",
@@ -73,13 +73,21 @@
         "keyval": {
           "public": "uRPdSiL3/MNsk50z6NB55ABo0OrrNDXigtCul4vtzmw="
         }
+      },
+      "ae2c941863a3219fb3a12579a020642b912ab39b4ff3d1cc20ad317afd0d94c5": {
+        "keytype":"ed25519",
+        "keyval": {
+          "public":"m/y6qGlVTmG9i51hfz5ebhenP82vM6oYokkQsj8Pcx4="
+        }
       }
     },
     "roles": {
       "mirrors": {
         "keyids": [
           "280b10153a522681163658cb49f632cde3f38d768b736ddbc901d99a1a772833",
-          "772e9f4c7db33d251d5c6e357199c819e569d130857dc225549b40845ff0890d"
+          "772e9f4c7db33d251d5c6e357199c819e569d130857dc225549b40845ff0890d",
+          "ae2c941863a3219fb3a12579a020642b912ab39b4ff3d1cc20ad317afd0d94c5",
+          "1ea9ba32c526d1cc91ab5e5bd364ec5e9e8cb67179a471872f6e26f0ae773d42"
         ],
         "threshold": 1
       },
@@ -110,6 +118,6 @@
         "threshold": 1
       }
     },
-    "version": 3
+    "version": 4
   }
 }