fix: remove invalid boolean enum from issue_write delete parameter

Author: Mazen-Embaby

pkg/github/__toolsnaps__/issue_write.snap

@@ -38,9 +38,6 @@
           "properties": {
             "delete": {
               "description": "Set to true to clear this field's current value on the issue. Cannot be combined with 'value' or 'field_option_name'.",
-              "enum": [
-                true
-              ],
               "type": "boolean"
             },
             "field_name": {

pkg/github/issues.go

@@ -2234,7 +2234,6 @@ Options are:
 								},
 								"delete": {
 									Type: "boolean",
-									Enum: []any{true},
 									Description: "Set to true to clear this field's current value on the " +
 										"issue. Cannot be combined with 'value' or 'field_option_name'.",
 								},