Dockerfile: use more recent build env, #441
Dockerfile: use more recent build env, #441

Thanks flucrezia for the suggestion

Closes: https://github.com/grobian/carbon-c-relay/issues/441
Signed-off-by: Fabian Groffen <2c4829061e3ecacc1da315323749610b9ffaef65@gentoo.org>

grobian/carbon-c-relay,grobian/carbon-c-relay,grobian/carbon-c-relay