net: bump TestDialerDualStackFDLeak timeout on iOS
net: bump TestDialerDualStackFDLeak timeout on iOS

On an iPhone 6 running iOS 11, the TestDialerDualStackFDLeak test
started failing with dial durations just above the limit:

FAIL: TestDialerDualStackFDLeak (0.21s)

	dial_test.go:90: got 101.154ms; want <= 95ms

Bump the timeout on iOS.

For the iOS builder.

Change-Id: Id42b471e7cf7d0c84f6e83ed04b395fa1a2d449d
Reviewed-on: https://go-review.googlesource.com/66491
Run-TryBot: Elias Naur <993af7099cb24ce1a88d64108ae1e8b0385f2fc0@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

polyverse-security/go,golang/go,golang/go,codestation/go,cloudflare/go,cloudflare/go,josharian/go,akutz/go,CAFxX/go,josharian/go,polyverse-security/go,CAFxX/go,cloudflare/go,nawawi/go,nawawi/go,cloudflare/go,nawawi/go,golang/go,akutz/go,akutz/go,akutz/go,codestation/go,polyverse-security/go,akutz/go,josharian/go,josharian/go,josharian/go,codestation/go,akutz/go,nawawi/go,golang/go,CAFxX/go,codestation/go,golang/go,polyverse-security/go,CAFxX/go,akutz/go,CAFxX/go,cloudflare/go,nawawi/go,Cofyc/go,josharian/go,CAFxX/go,codestation/go,Cofyc/go,Cofyc/go,akutz/go,polyverse-security/go,nawawi/go,cloudflare/go,Cofyc/go,Cofyc/go,codestation/go,codestation/go,golang/go,CAFxX/go,polyverse-security/go,cloudflare/go,nawawi/go,polyverse-security/go,josharian/go,golang/go,CAFxX/go,Cofyc/go,nawawi/go,Cofyc/go,christopher-henderson/Go,josharian/go,Cofyc/go,polyverse-security/go,codestation/go,golang/go,cloudflare/go