deps: update dependency org.testcontainers:testcontainers to v1.20.6 - autoclosed#1949

renovate-bot wants to merge 1 commit intogoogleapis:maingoogleapis/java-spanner-jdbc:mainfrom

renovate-bot:renovate/org.testcontainers-testcontainers-1.xrenovate-bot/java-spanner-jdbc:renovate/org.testcontainers-testcontainers-1.xCopy head branch name to clipboard