Widen the accepted pimsync range to the 0.6 series; stream sync output and bound the Google HTTP calls

The version work and the sync-output work landed in one change; they can be
split apart if the history wants them separate.

flake.lock

@@ -16,9 +16,28 @@
         "type": "github"
       }
     },
+    "pimsync-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1788568982,
+        "narHash": "sha256-vpmms553q1mzxfkMGEjvTddQVksEAzu50g8bVudZsXg=",
+        "ref": "refs/tags/v0.6.0",
+        "rev": "a111a44cd9e65c031ce9801fdced912057e4a4a0",
+        "revCount": 1616,
+        "type": "git",
+        "url": "https://git.sr.ht/~whynothugo/pimsync"
+      },
+      "original": {
+        "ref": "refs/tags/v0.6.0",
+        "rev": "a111a44cd9e65c031ce9801fdced912057e4a4a0",
+        "type": "git",
+        "url": "https://git.sr.ht/~whynothugo/pimsync"
+      }
+    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "pimsync-src": "pimsync-src"
       }
     }
   },