xmlrpc has been removed from the bundled gems

.github/workflows/macos.yml

@@ -51,7 +51,7 @@ jobs:
         env:
           RUBY_TESTOPTS: "-q --tty=no"
           # Remove minitest from TEST_BUNDLED_GEMS_ALLOW_FAILURES if https://github.com/seattlerb/minitest/pull/798 is resolved
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: "minitest,xmlrpc,rexml"
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: "minitest,rexml"
       - uses: k0kubun/action-slack@v2.0.0
         with:
           payload: |

.github/workflows/ubuntu.yml

@@ -73,7 +73,7 @@ jobs:
         env:
           RUBY_TESTOPTS: "-q --tty=no"
           # Remove minitest from TEST_BUNDLED_GEMS_ALLOW_FAILURES if https://github.com/seattlerb/minitest/pull/798 is resolved
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: "minitest,xmlrpc"
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: "minitest"
       - uses: k0kubun/action-slack@v2.0.0
         with:
           payload: |