Update julia
Update julia

Changes:

- https://github.com/docker-library/julia/commit/9bf26c2: Merge pull request https://github.com/docker-library/julia/pull/69 from infosiftr/1.8-ga
- https://github.com/docker-library/julia/commit/dab974e: Remove 1.7 series (EOL)
- https://github.com/docker-library/julia/commit/2c77019: Update to 1.8.0 (GA)

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