Bump swift from 6.2.4-bookworm to 6.3.0-bookworm in /.github/docker (#2357)

Bumps swift from 6.2.4-bookworm to 6.3.0-bookworm.


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.github/docker/Dockerfile.swift

@@ -1,3 +1,3 @@
-FROM swift:6.2.4-bookworm@sha256:6ff0d2567e1a9ce6b2bb1212a8d7ade9dc90e6fb02bed349fc664b981c206858
+FROM swift:6.3.0-bookworm@sha256:943bb41624442cef8ccca256f1ff7830ce25209cbad88ebfede0aaef268a8a80
 
 CMD echo this is a dummy file used to automate dependency upgrades for plugins