Update julia

Changes:

- https://github.com/docker-library/julia/commit/a427b70: Update to 1.4.2
- https://github.com/docker-library/julia/commit/0b06df9: Merge pull request https://github.com/docker-library/julia/pull/44 from docker-library/github-actions
- https://github.com/docker-library/julia/commit/33138c1: Add initial GitHub Actions CI

library/julia

@@ -4,23 +4,23 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/julia.git
 
-Tags: 1.4.1-buster, 1.4-buster, 1-buster, buster
-SharedTags: 1.4.1, 1.4, 1, latest
-Architectures: amd64, arm32v7, arm64v8, i386
-GitCommit: 35ec6b3efb79d22ae7812772d1defdf66bb8990e
+Tags: 1.4.2-buster, 1.4-buster, 1-buster, buster
+SharedTags: 1.4.2, 1.4, 1, latest
+Architectures: amd64, arm64v8, i386
+GitCommit: a427b70887e18776bf16b3f06bfc136a65392690
 Directory: 1.4/buster
 
-Tags: 1.4.1-windowsservercore-ltsc2016, 1.4-windowsservercore-ltsc2016, 1-windowsservercore-ltsc2016, windowsservercore-ltsc2016
-SharedTags: 1.4.1, 1.4, 1, latest
+Tags: 1.4.2-windowsservercore-ltsc2016, 1.4-windowsservercore-ltsc2016, 1-windowsservercore-ltsc2016, windowsservercore-ltsc2016
+SharedTags: 1.4.2, 1.4, 1, latest
 Architectures: windows-amd64
-GitCommit: 35ec6b3efb79d22ae7812772d1defdf66bb8990e
+GitCommit: a427b70887e18776bf16b3f06bfc136a65392690
 Directory: 1.4/windows/windowsservercore-ltsc2016
 Constraints: windowsservercore-ltsc2016
 
-Tags: 1.4.1-windowsservercore-1809, 1.4-windowsservercore-1809, 1-windowsservercore-1809, windowsservercore-1809
-SharedTags: 1.4.1, 1.4, 1, latest
+Tags: 1.4.2-windowsservercore-1809, 1.4-windowsservercore-1809, 1-windowsservercore-1809, windowsservercore-1809
+SharedTags: 1.4.2, 1.4, 1, latest
 Architectures: windows-amd64
-GitCommit: 35ec6b3efb79d22ae7812772d1defdf66bb8990e
+GitCommit: a427b70887e18776bf16b3f06bfc136a65392690
 Directory: 1.4/windows/windowsservercore-1809
 Constraints: windowsservercore-1809