Bump ip from 1.1.8 to 1.1.9 #396

Job	Run time
test (ubuntu)	36s
test (macOS)	1m 5s
test-no-options (ubuntu)	30s
test-specific-variant	33s
test (windows)	1m 17s
test-js-project-in-subdir-with-overrides	40s
test-no-options (macOS)	1m 13s
test-no-options (windows)	2m 3s
test-specific-volta (1.0.0, macOS)	50s
test-specific-volta-node-npm-yarn (ubuntu)	32s
test-specified-node-npm-yarn-overrides-pinned-versions (ubuntu)	32s
test-specific-volta (1.0.0, windows)	2m 13s
test-specific-volta-node-npm-yarn (macOS)	1m 19s
test-specified-node-npm-yarn-overrides-pinned-versions (macOS)	1m 6s
test-specified-registry-url (ubuntu)	38s
test-specific-volta (1.0.8, ubuntu)	32s
test-specified-node-npm-yarn-overrides-pinned-versions (windows)	2m 42s
test-specified-registry-url (macOS)	1m 16s
test-specific-volta (1.0.8, macOS)	1m 22s
test-specific-volta-node-npm-yarn (windows)	2m 7s
test-specified-registry-url (windows)	1m 52s
test-specific-volta (1.0.8, windows)	2m 6s
test-specific-volta (1.1.0, ubuntu)	33s
test-js-project-in-subdir-no-options	30s
test-specific-volta (1.1.0, macOS)	58s
test-specific-volta (1.1.0, windows)	2m 8s
	31m 13s

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