Dockerfile: update base image to move past snyk vulnerability #34

Job	Run time
pre-build	3s
build-test-push / Build test publish	2m 4s
deploy-staging / report-expected-deployment	12s
deploy-prod / report-expected-deployment	22s
deploy-staging / deploy / terraform	2m 46s
deploy-prod / deploy / terraform	2m 46s
	8m 13s

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