Bump ip from 1.1.8 to 1.1.9 #394

Job	Run time
test-specified-node-npm-yarn-overrides-pinned-versions (ubuntu)	31s
test-specified-node-npm-yarn-overrides-pinned-versions (macOS)	1m 33s
test-specific-volta (1.0.0, macOS)	1m 3s
test-js-project-in-subdir-no-options	1m 1s
test (ubuntu)	35s
test-specified-node-npm-yarn-overrides-pinned-versions (windows)	2m 9s
test-specific-volta (1.0.0, windows)	1m 7s
test (macOS)	1m 8s
test-specific-volta (1.0.8, ubuntu)	41s
test-js-project-in-subdir-with-overrides	37s
test (windows)	1m 37s
test-specific-volta (1.0.8, macOS)	45s
test-no-options (ubuntu)	30s
test-specific-volta (1.0.8, windows)	1m 38s
test-no-options (macOS)	48s
test-specific-variant	34s
test-specific-volta (1.1.0, ubuntu)	33s
test-specific-volta-node-npm-yarn (ubuntu)	32s
test-no-options (windows)	2m 6s
test-specific-volta (1.1.0, macOS)	40s
test-specific-volta-node-npm-yarn (macOS)	33s
test-specific-volta (1.1.0, windows)	1m 33s
test-specific-volta-node-npm-yarn (windows)	1m 23s
test-specified-registry-url (ubuntu)	30s
test-specified-registry-url (macOS)	31s
test-specified-registry-url (windows)	1m 20s
	25m 58s

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