test: skip locklinear's lockmany test for now
test: skip locklinear's lockmany test for now

Since it's been reliably failing on one of the linux-arm builders
(arm5spacemonkey) for a long time.

Updates #24221.

Change-Id: I8fccc7e16631de497ccc2c285e510a110a93ad95
Reviewed-on: https://go-review.googlesource.com/104535
Run-TryBot: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

Cofyc/go,Cofyc/go,nawawi/go,cloudflare/go,golang/go,akutz/go,akutz/go,akutz/go,golang/go,Cofyc/go,golang/go,akutz/go,cloudflare/go,Cofyc/go,cloudflare/go,Cofyc/go,josharian/go,nawawi/go,golang/go,akutz/go,josharian/go,CAFxX/go,Cofyc/go,golang/go,CAFxX/go,CAFxX/go,nawawi/go,akutz/go,golang/go,nawawi/go,Cofyc/go,nawawi/go,cloudflare/go,CAFxX/go,akutz/go,Cofyc/go,josharian/go,nawawi/go,akutz/go,josharian/go,golang/go,josharian/go,cloudflare/go,CAFxX/go,CAFxX/go,josharian/go,nawawi/go,cloudflare/go,golang/go,cloudflare/go,josharian/go,CAFxX/go,nawawi/go,CAFxX/go,josharian/go,cloudflare/go