Make machine readable dates single

we only allow 0-1 as the cardinality and therefor these fields should be multiple: false

maps/utk.yml

@@ -10,7 +10,7 @@ profile:
   responsibility: https://www.lib.utk.edu
   responsibility_statement: University of Tennessee Libraries
   type: UTK Digital Collections v40 - Change "Spatial Coverage" label to "Location"
-  version: 41
+  version: 42
 
 classes:
   Attachment:
@@ -1150,7 +1150,7 @@ properties:
     cardinality:
       maximum: 1
       minimum: 0
-    multi_value: true
+    multi_value: false
     controlled_values:
       format: http://www.w3.org/2001/XMLSchema#date
       sources:
@@ -1223,7 +1223,7 @@ properties:
     cardinality:
       maximum: 1
       minimum: 0
-    multi_value: true
+    multi_value: false
     controlled_values:
       format: http://www.w3.org/2001/XMLSchema#date
       sources: