chore(deps): bump ubuntu from focal-20210401 to focal-20210416 (#43)

Bumps ubuntu from focal-20210401 to focal-20210416.

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:focal-20210401
+FROM ubuntu:focal-20210416
 
 # Overlay defaults
 ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2 \