Switch from 512-bit to 2048-bit key

go/internal/testhelper/testdata/testroot/certs/valid/server.crt

 -----BEGIN CERTIFICATE-----
-MIIBsDCCAVqgAwIBAgIJALlYxbvxYURTMA0GCSqGSIb3DQEBCwUAMBQxEjAQBgNV
-BAMMCWxvY2FsaG9zdDAeFw0xOTA1MDEwNzM2MDNaFw0yOTA0MjgwNzM2MDNaMBQx
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-I5Dfu3INMU/9Id+EoHorJwkN6oUuRMjwdwjzZaa1WLWlkw7EHYwk1YC3qltKnDp/
-PuFxwQ==
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+bLdoPfnatZ7f5m9DuoOsGlYAZbLfOl2NywgO0jAlnHJGEQ==
 -----END CERTIFICATE-----

go/internal/testhelper/testdata/testroot/certs/valid/server.key

------BEGIN PRIVATE KEY-----
-MIIBVwIBADANBgkqhkiG9w0BAQEFAASCAUEwggE9AgEAAkEA5YE+G9Ln40epiGk7
-j+JV17WO+GJRw5YeJv6qg+Gkyz1P8enzL76rKiKil/XpgM/1Oa817xisKTdg5QSh
-AA81swIDAQABAkEAofMPhsbPB1y8TxwjAadvd+YQW0nV9LRr1oyCesmxZhAp0KQq
-3vLs24nQAYH7mAtfcpv0l1t8NHl6JajZd3sLIQIhAPLQ4HuZSGPTncJFZv4/tqwf
-uXmouo9Fo7+eAXXx1H5LAiEA8fdXw/vuUzb+3I/hwkS5i1zgsYdMye63UffH+aSS
-5TkCIQC1ZskebaCAO7szROgx7+WH59eIBT8DBFLWN7P9qmJGywIhALPDL7gRxgia
-thPE7VN33WUVNnWN8FWhfR5veGkWhG+5AiEAnxDUMc2ZewuNkPZHZAIobRAily+q
-Q5REf1FU92ptvbg=
------END PRIVATE KEY-----
+-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEAmte3G/eD+quamwyFl+2jEo8ngSAT0FWeY5ZAwRvdF4FgtTBL
+vbAdTnyi7pHMesCSUkyxXHHPazM4SDV6uiu5LNKF0iz/NY76rLtFoqSGUgygTZHV
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+Nw4TxqF31ngN8MBr+4n9UQKBgAkxAoEQ/zh79fW6/8fPbHjOxmdd0LRw2s+mCC8E
+RhZTKuZIgJWluvkEe7EMT6QmS+OUhzZ25DBQ+3NpGVilOSPmXMa6LgQ5QIChA0zJ
+KRbrIE2nflEu3FnGJ3aFfpOGdmIU00yjSmHXrAA0aPh4EIZo++Bo4Yo8x+hNhElj
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+OcZGE6xPZJidv1Bcv60L1VzTMj7spvMRTeumn2zEQGjkl6i/fSZzawjmKaKXKNkC
+YfoV0RepB4TlNYGICaTcV+aKRIXivcpBGfduZEb39iUKCjh9Afg=
+-----END RSA PRIVATE KEY-----