Bump version to v0.5.4

Bumps the Julia and Python SDK versions to 0.5.4. The
`(relations …)` CSV loading construct (#259) landed on main after
the v0.5.3 tag without a version bump, so main currently reports
0.5.3 while containing changes beyond that release. This cuts a
distinct version so the content is traceable to a tagged release.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: hbarthels

sdks/julia/LogicalQueryProtocol.jl/Project.toml

@@ -1,6 +1,6 @@
 name = "LogicalQueryProtocol"
 uuid = "a92373ee-6cc4-4662-ae66-0c99a03ebae1"
-version = "0.5.3"
+version = "0.5.4"
 authors = ["RelationalAI"]
 
 [deps]

sdks/python/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "lqp"
-version = "0.5.3"
+version = "0.5.4"
 description = "Validate and translate Logical Query Protocol (LQP) S-expressions into Protobuf"
 readme = "README.md"
 authors = [