feat: Update generated clients to depend on google-apis-core 0.15.0 (#18985)

Author: aandreassa

google-apis-generator/google-apis-generator.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = ">= 2.7"
   gem.add_runtime_dependency "activesupport", ">= 5.0"
   gem.add_runtime_dependency "gems", "~> 1.2"
-  gem.add_runtime_dependency "google-apis-core", ">= 0.14.0", "< 2.a"
+  gem.add_runtime_dependency "google-apis-core", ">= 0.15.0", "< 2.a"
   gem.add_runtime_dependency "google-apis-discovery_v1", "~> 0.14"
   gem.add_runtime_dependency "thor", ">= 0.20", "< 2.a"
 end

google-apis-generator/lib/google/apis/generator/templates/gemspec.tmpl

@@ -29,5 +29,5 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
 
   gem.required_ruby_version = '>= 2.7'
-  gem.add_runtime_dependency "google-apis-core", ">= 0.14.0", "< 2.a"
+  gem.add_runtime_dependency "google-apis-core", ">= 0.15.0", "< 2.a"
 end