Update deprecated use of LGPL-3.0 license identifier

Author: spohlenz

package.json

@@ -5,7 +5,7 @@
   "main": "index.scss",
   "repository": "https://github.com/TrestleAdmin/trestle-search.git",
   "author": "Sam Pohlenz <sam@sampohlenz.com>",
-  "license": "LGPL-3.0",
+  "license": "LGPL-3.0-only",
   "private": true,
   "scripts": {
     "dev": "webpack --mode development",

trestle-search.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
 
   spec.summary       = "Search plugin for the Trestle admin framework"
   spec.homepage      = "https://www.trestle.io"
-  spec.license       = "LGPL-3.0"
+  spec.license       = "LGPL-3.0-only"
 
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
     `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(spec)/}) }