RUBY-3279 Bump min server version for FLE test (#2779)

Author: comandeo-mongo

spec/spec_tests/data/client_side_encryption/explain.yml

@@ -1,5 +1,5 @@
 runOn:
-  - minServerVersion: "4.1.10"
+  - minServerVersion: "7.0.0"
 database_name: &database_name "default"
 collection_name: &collection_name "default"
 
@@ -54,4 +54,4 @@ tests:
         # Outcome is checked using a separate MongoClient without auto encryption.
         data:
           - *doc0_encrypted
-          - *doc1_encrypted
+          - *doc1_encrypted