spec_helper: increase tests timeout.

When GitHub Actions is congested some tests can take longer than this
(particularly as we're running in parallel). Globally double the time
we allow for all tests.

Library/Homebrew/test/cmd/reinstall_spec.rb

@@ -7,7 +7,7 @@ describe "Homebrew.reinstall_args" do
   it_behaves_like "parseable arguments"
 end
 
-describe "brew reinstall", :integration_test, timeout: 120 do
+describe "brew reinstall", :integration_test do
   it "reinstalls a Formula" do
     install_test_formula "testball"
     foo_dir = HOMEBREW_CELLAR/"testball/0.1/bin"

Library/Homebrew/test/dev-cmd/test_spec.rb

@@ -7,7 +7,7 @@ describe "Homebrew.test_args" do
 end
 
 # randomly segfaults on Linux with portable-ruby.
-describe "brew test", :integration_test, :needs_macos, timeout: 120 do
+describe "brew test", :integration_test, :needs_macos do
   it "tests a given Formula" do
     install_test_formula "testball", <<~'RUBY'
       test do

Library/Homebrew/test/spec_helper.rb

@@ -181,7 +181,7 @@ RSpec.configure do |config|
       end
 
       begin
-        timeout = example.metadata.fetch(:timeout, 60)
+        timeout = example.metadata.fetch(:timeout, 120)
         inner_timeout = nil
         Timeout.timeout(timeout) do
           example.run