Fix unterminated warning message that breaks gotestsum -> junit parsing

[evankanderson]

Summary

The HTML error summary often erroneously reports that TestGetGrpcConnection and some subset of tests have failed due to corrupted output from the terminal:

=== RUN   TestGetGrpcConnection
=== RUN   TestGetGrpcConnection/If_the_token_is_provided,_create_connection_without_calling_server
=== RUN   TestGetGrpcConnection/With_token,_don't_dial_or_handshake_endpoint
=== RUN   TestGetGrpcConnection/Connect_and_get_token_from_GRPC_handshake
=== RUN   TestGetGrpcConnection/Localhost_GRPC_auto-discovery
=== RUN   TestGetGrpcConnection/GRPC_auto-discovery_with_insecure_external_host
=== RUN   TestGetGrpcConnection/Defaults_connect_to_legacy_endpoint
Unable to fetch WWW-Authenticate header (rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing: dial tcp 127.0.0.1:35443: connect: connection refused"), falling back on static configuration--- PASS: TestGetGrpcConnection (0.02s)
    --- PASS: TestGetGrpcConnection/If_the_token_is_provided,_create_connection_without_calling_server (0.00s)
    --- PASS: TestGetGrpcConnection/With_token,_don't_dial_or_handshake_endpoint (0.00s)
    --- PASS: TestGetGrpcConnection/Connect_and_get_token_from_GRPC_handshake (0.00s)
    --- PASS: TestGetGrpcConnection/Localhost_GRPC_auto-discovery (0.01s)
    --- PASS: TestGetGrpcConnection/GRPC_auto-discovery_with_insecure_external_host (0.00s)
    --- PASS: TestGetGrpcConnection/Defaults_connect_to_legacy_endpoint (0.00s)

Testing

Manual / eyeball testing

[coveralls]

coverage: 59.314%. remained the same — evankanderson:fix-test-breaking-output into mindersec:main