Minor update to the field name and numbering for test suites (#457)

Author: TristonianJones

conformance/test/suite.pb.go

@@ -81,7 +81,7 @@ message TestCase {
 
   // A map representing a variable binding where the key is the name of the
   // input variable.
-  map<string, InputValue> input_bindings = 5;
+  map<string, InputValue> input = 5;
 
   // Input in the form of a context proto for the test case.
   // Note: Only one of `input_bindings` and `input_context` can be provided. Providing
@@ -107,13 +107,13 @@ message InputContext {
   oneof input_context_kind {
     // A context message represents an input kind in the form of a proto
     // message whose type is defined at runtime.
-    google.protobuf.Any context_message = 2;
+    google.protobuf.Any context_message = 1;
 
     // A context expression representing a context proto variable. The
     // fields of the input proto.Messages are used as top-level variables within
     // an Activation. The expression is evaluated using the cel environment
     // configured for the test suite.
-    string context_expr = 3;
+    string context_expr = 2;
   }
 }