test/integration: bump timeout to 20s

[aurel32]

The current timeout seems to assume a relatively fast host, double it to make the testsuite pass on slower hosts.

This is need for instance to build kube-openapi on Debian riscv64 build daemons, which are a tad too slow for the current timeout: https://buildd.debian.org/status/fetch.php?pkg=golang-k8s-kube-openapi&arch=riscv64&ver=0.0%7Egit20231214.ab13479-1&stamp=1707440925&raw=0

[linux-foundation-easycla]

• ✅login: aurel32 / (b4a5507)

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[alexzielenski]

/lgtm
/approve

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