Bump version to 1.0.4 and update README, task.json, and vss-extension.json for consistency

task/AzureFederatedAuth/task.json

@@ -10,7 +10,7 @@
   "version": {
     "Major": 1,
     "Minor": 0,
-    "Patch": 3
+    "Patch": 4
   },
   "instanceNameFormat": "Configure federated auth: $(serviceConnectionARM)",
   "inputs": [
@@ -20,7 +20,7 @@
       "label": "Azure Resource Manager service connection",
       "defaultValue": "",
       "required": true,
-      "helpMarkDown": "AzureRM service connection used to request the OIDC token."
+      "helpMarkDown": "AzureRM service connection used to request the OIDC token. Requires System.AccessToken to be available to the job."
     },
     {
       "name": "setGitAccessToken",