tests/integration: deflake TestV3AuthWithLeaseRevokeWithRootJWT

[YaoC]

For jwt, when:

• ttl=1s, token will expire within (0, 1s].
• ttl=2s, token will expire within (1s, 2s].

Update JWT ttl to 2s, so that it won't expire immediately. The token is only used in TestV3AuthWithLeaseRevokeWithRootJWT

etcd/tests/integration/v3_auth_test.go

Lines 145 to 147 in d4a0b88

	func TestV3AuthWithLeaseRevokeWithRootJWT(t *testing.T) {
	testV3AuthWithLeaseRevokeWithRoot(t, integration.ClusterConfig{Size: 1, AuthToken: integration.DefaultTokenJWT})
	}

Close #16475

read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[jmhbnz]

LGTM - Thanks for fixing this @YaoC.