Drop LetsEncrypt X3 expired root test

The cert that was used to test this was an actual certificate signed by
an expired LetsEncrypt R3 intermediate certificate.

Since it's not easy to reproduce this case, let's drop this test to
allow master builds to work again.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/349446

spec/factories/pages_domains.rb

@@ -258,18 +258,6 @@ ZDXgrA==
       certificate_source { :gitlab_provided }
     end
 
-    # This contains:
-    # webdioxide.com
-    # Let's Encrypt R3
-    # ISRG Root X1 (issued by DST Root CA X3)
-    #
-    # DST Root CA X3 expired on 2021-09-30, but ISRG Root X1 should be trusted on most systems.
-    trait :letsencrypt_expired_x3_root do
-      certificate do
-        File.read(Rails.root.join('spec/fixtures/ssl', 'letsencrypt_expired_x3.pem'))
-      end
-    end
-
     trait :explicit_ecdsa do
       certificate do
         '-----BEGIN CERTIFICATE-----

spec/factories_spec.rb

@@ -31,7 +31,6 @@ RSpec.describe 'factories' do
       [:pages_domain, :with_trusted_chain],
       [:pages_domain, :with_trusted_expired_chain],
       [:pages_domain, :explicit_ecdsa],
-      [:pages_domain, :letsencrypt_expired_x3_root],
       [:project_member, :blocked],
       [:remote_mirror, :ssh],
       [:user_preference, :only_comments],

spec/fixtures/ssl/letsencrypt_expired_x3.pem

------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
-
------BEGIN CERTIFICATE-----
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-nLRbwHOoq7hHwg==
------END CERTIFICATE-----
-
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----

spec/models/pages_domain_spec.rb

@@ -287,19 +287,6 @@ RSpec.describe PagesDomain do
 
       it { is_expected.to be_truthy }
     end
-
-    # The LetsEncrypt DST Root CA X3 expired on 2021-09-30, but the
-    # cross-sign in ISRG Root X1 enables it to function provided a chain
-    # of trust can be established with the system store. See:
-    #
-    # 1. https://community.letsencrypt.org/t/production-chain-changes/150739
-    # 2. https://letsencrypt.org/2020/12/21/extending-android-compatibility.html
-    # 3. https://www.openssl.org/blog/blog/2021/09/13/LetsEncryptRootCertExpire/
-    context 'with a LetsEncrypt bundle with an expired DST Root CA X3' do
-      let(:domain) { build(:pages_domain, :letsencrypt_expired_x3_root) }
-
-      it { is_expected.to be_truthy }
-    end
   end
 
   describe '#expired?' do