Fix false positive E3062 when EngineVersion is unquoted float (#4454)

When YAML parses an unquoted EngineVersion like 17.6, it becomes a
float instead of a string. The pattern keyword passed the raw float
to re.search(), which raises a TypeError on non-string input.

Fix the pattern keyword to accept int, float, and bool types and
convert to str before matching — consistent with how const and enum
already handle type coercion via the equal() function.

Fixes #4445

Author: kddejong

scripts/update_schemas_from_aws_api.py

@@ -301,7 +301,7 @@ def _create_schema(engine, engine_version, db_instance_classes):
                         "const": engine,
                     },
                     "EngineVersion": {
-                        "type": "string",
+                        "type": ["string", "number"],
                         "pattern": engine_pattern,
                     },
                     "DBInstanceClass": {