No copyright in PR template (apache#33)

No need to have the HTML escaped copyright header in the PR description

Co-authored-by: JB Onofré <jbonofre@apache.org>

.github/pull_request_template.md

@@ -1,16 +1 @@
-<!--
- Copyright (c) 2024 Snowflake Computing Inc.
- 
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
- 
-      http://www.apache.org/licenses/LICENSE-2.0
- 
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
--->
 <!-- Please describe your change here and remove this comment -->