Resolve "Renovate should monitor postgres and big-bang/base images"

• Update renovate config to include image in chart/deps/postgresql/values.yaml
• Update postgres dep image to registry1 image version 12.9
• Update bigbang/base image used in testing to version 1.0.0
• Update renovate config to include big-bang/base image in tests/test-values.yaml & chart/deps/postgresql/values.yaml

Relates #28 (closed) Closes #32 (closed)