Update julia
Update julia

Changes:

- https://github.com/docker-library/julia/commit/950674c: Update 1.8-rc to 1.8.0-rc4
- https://github.com/docker-library/julia/commit/d7bbacb: Update 1.8-rc
- https://github.com/docker-library/julia/commit/c843a70: Update 1.7
- https://github.com/docker-library/julia/commit/c685c07: Update 1.6

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