Return all values as a string (#3508)

Author: kddejong

src/cfnlint/jsonschema/_resolvers_cfn.py

@@ -246,7 +246,7 @@ def _replace(matchobj):
                     ref_values=c.ref_values,
                 )
             )
-            return value
+            return str(value)
         raise ValueError(f"No matches for {matchobj.group(2)!r}")
 
     try:

test/unit/rules/functions/test_sub.py

@@ -156,6 +156,12 @@ def context(cfn):
             {"type": "string"},
             [],
         ),
+        (
+            "Valid Fn::Sub with an integer parameter",
+            {"Fn::Sub": ["${Foo}", {"Foo": 1}]},
+            {"type": "string"},
+            [],
+        ),
         (
             "Invalid Fn::Sub with a too to many elements",
             {"Fn::Sub": ["${foo}", {"foo": "bar"}, {}]},