Update julia

Changes:

- https://github.com/docker-library/julia/commit/42e20c5: Merge pull request https://github.com/docker-library/julia/pull/93 from infosiftr/alpine3.21
- https://github.com/docker-library/julia/commit/c763e6d: Add Alpine 3.21 (drop 3.19)

library/julia

@@ -15,15 +15,15 @@ Architectures: amd64, arm64v8, i386
 GitCommit: 4f01bdd0f40fb73588ec2fb1425939f0b942eaaf
 Directory: 1.11/bullseye
 
-Tags: 1.11.2-alpine3.20, 1.11-alpine3.20, 1-alpine3.20, alpine3.20, 1.11.2-alpine, 1.11-alpine, 1-alpine, alpine
+Tags: 1.11.2-alpine3.21, 1.11-alpine3.21, 1-alpine3.21, alpine3.21, 1.11.2-alpine, 1.11-alpine, 1-alpine, alpine
 Architectures: amd64
-GitCommit: 4f01bdd0f40fb73588ec2fb1425939f0b942eaaf
-Directory: 1.11/alpine3.20
+GitCommit: c763e6dd2005540877917987840d0128b819de91
+Directory: 1.11/alpine3.21
 
-Tags: 1.11.2-alpine3.19, 1.11-alpine3.19, 1-alpine3.19, alpine3.19
+Tags: 1.11.2-alpine3.20, 1.11-alpine3.20, 1-alpine3.20, alpine3.20
 Architectures: amd64
 GitCommit: 4f01bdd0f40fb73588ec2fb1425939f0b942eaaf
-Directory: 1.11/alpine3.19
+Directory: 1.11/alpine3.20
 
 Tags: 1.11.2-windowsservercore-ltsc2022, 1.11-windowsservercore-ltsc2022, 1-windowsservercore-ltsc2022, windowsservercore-ltsc2022
 SharedTags: 1.11.2, 1.11, 1, latest, 1.11.2-windowsservercore, 1.11-windowsservercore, 1-windowsservercore, windowsservercore