add license to a new file

Signed-off-by: Michal Wasilewski <michal@mwasilewski.net>
Signed-off-by: Michal Wasilewski <mwasilewski@gmx.com>

collector/cpu_vulnerabilities_linux.go

@@ -1,3 +1,16 @@
+// Copyright 2023 The Prometheus Authors
+// 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.
+
 package collector
 
 import (