sanitize *auth* instead of authorization

[stuartnelson3]

closes #1166

[axw]

LGTM!

[stuartnelson3]

Failure is due to http2 :authority pseudo-header, which should be excluded: elastic/apm#575

[ghost]

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• Start Time: 2022-03-23T09:57:35.120+0000

• Duration: 49 min 37 sec

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