Update julia
Update julia

Changes:

- https://github.com/docker-library/julia/commit/92c1731: Merge pull request https://github.com/docker-library/julia/pull/47 from lungben/master
- https://github.com/docker-library/julia/commit/4c89f47: Exclude Alpine variants in GitHub Actions i386 test builds
- https://github.com/docker-library/julia/commit/fb8e276: Add Alpine template and resync with how Debian images are structured
- https://github.com/docker-library/julia/commit/9297767: Dockerfile for Alpine-based Julia 1.5 added

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