Bump github.com/lestrrat-go/jwx in /extra/server-discovery #1513

Job	Run time
Server tests	2m 17s
Library test (js)	51s
Web client test (admin)	1m 12s
Library test (vue)	56s
Web client test (compose)	1m 22s
Web client test (discovery)	1m 20s
Web client test (privacy)	1m 18s
Web client test (reporter)	1m 19s
Web client test (one)	1m 12s
Web client test (workflow)	1m 16s
Send matrix testing notification	0s
	13m 3s

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