feat(cozy-viewer): Upgrade cozy-client peerDependency to 49.0.0

This version introduces the new `downloadFile()` method that is
compatible with Offline mode

Related PR: cozy/cozy-client#1507

BREAKING CHANGE: cozy-viewer now requires cozy-client >= 49.0.0 (used
for offline support)

packages/cozy-viewer/package.json

@@ -50,7 +50,7 @@
     "react-pdf": "^5.7.2"
   },
   "peerDependencies": {
-    "cozy-client": ">=48.8.0",
+    "cozy-client": ">=49.0.0",
     "cozy-device-helper": ">=2.0.0",
     "cozy-harvest-lib": ">=6.7.3",
     "cozy-intent": ">=1.16.1",