Update Docker image for 0.6.0

[kmille]

Currently, it just breaks:

kmille@linbox:freetar sudo docker build --no-cache --rm . -t kmille2/freetar:latest
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon   1.41MB
Step 1/14 : FROM python:3.11-alpine3.18 AS builder
 ---> 21907f0cf511
Step 2/14 : RUN apk update
 ---> Running in 2ebfab681f40
fetch https://dl-cdn.alpinelinux.org/alpine/v3.18/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.18/community/x86_64/APKINDEX.tar.gz
WARNING: updating and opening https://dl-cdn.alpinelinux.org/alpine/v3.18/main: temporary error (try again later)
WARNING: updating and opening https://dl-cdn.alpinelinux.org/alpine/v3.18/community: temporary error (try again later)
4 unavailable, 0 stale; 38 distinct packages available
The command '/bin/sh -c apk update' returned a non-zero code: 4
kmille@linbox:freetar poetry version    
freetar 0.6.0

Don't have the capacity to check right now, but looks like it's not our fault.