9086: minor: try fixing proc_macro_srv tests r=jonas-schievink a=jonas-schievink

Not entirely sure what's going wrong in https://github.com/rust-analyzer/rust-analyzer/pull/9084, but this might fix it?

bors r+

Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
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bors[bot] 2021-05-31 16:59:29 +00:00 committed by GitHub
commit 020610f453
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@ -16,7 +16,7 @@ pub mod fixtures {
let name = "proc_macro_test";
let version = "0.0.0";
let command = Command::new(toolchain::cargo())
.args(&["build", "-p", name, "--message-format", "json"])
.args(&["check", "--tests", "--message-format", "json"])
.output()
.unwrap()
.stdout;