chore(workflow): 🔧 update branch formatting and module version

* Removed extra space in branch name definition.
* Updated `psmodulecache` action version from `v5.1` to `v6.0`.

Author: HeyItsGilbert

.github/workflows/publish.yaml

@@ -1,7 +1,7 @@
 name: Publish Module
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   workflow_dispatch:
 jobs:
   build:
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install and cache PowerShell modules
         id: psmodulecache
-        uses: potatoqualitee/psmodulecache@v5.1
+        uses: potatoqualitee/psmodulecache@v6.0
         with:
           modules-to-cache: BuildHelpers, PowerShellBuild, psake, PSScriptAnalyzer, platyPS
       - shell: pwsh