Bump swift from 6.2.2-bookworm to 6.2.3-bookworm in /.github/docker (#2159)

Bumps swift from 6.2.2-bookworm to 6.2.3-bookworm.


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.github/docker/Dockerfile.swift

@@ -1,3 +1,3 @@
-FROM swift:6.2.2-bookworm
+FROM swift:6.2.3-bookworm
 
 CMD echo this is a dummy file used to automate dependency upgrades for plugins