RUBY-3397 update the public key for signing gems

gem-public_cert.pem

@@ -1,7 +1,7 @@
 -----BEGIN CERTIFICATE-----
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@@ -14,13 +14,13 @@ VYSiCHuc3yEDyq5M+98WGX2etbj6esYtzI3rDevpIAHPB6HQmtoJIA4dSl3gjFb+
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 -----END CERTIFICATE-----