CI: update setup-miniconda to version 3 and checkout to v4 (#12032)

Fix condaBasePath when useBundled is false, and there's no pre-existing conda

..other fix and improvements
Update sub_buildMacOSCondaIntel.yml

Revert
updated action checkout to version 4

updated setup-miniconda to version 3

.github/workflows/sub_buildUbuntu2004.yml

@@ -72,7 +72,7 @@ jobs:
 
     steps:
       - name: Checking out source code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: true
       - name: Install FreeCAD dependencies