DuckDB v1.5.6 Bugfix Release

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Key Architectural Takeaway

This is a bug fix release for various issues discovered after we released v1.5.5 What's Changed Use relative includes in unity build sources for cache reuse by @NiclasHaderer in #23972 bump vortex by @samansmink in #24089 [variegata] Remove Julia client in favor of duckdb/DuckDB.jl by @evertlammerts in #24127 [variegata] Replace the C API spec and code generation by @evertlammerts in #24131 TopNWindowElimination Fixes by @d-justen in #24080 Fix active query race by @NiclasHaderer in #24123 Fix UNNEST Pushdown by @d-justen in #24119 [Parquet][Variant] Don't produce VARIANT metadata with sorted_strings set by @Tishj in #23591 Fix LIMIT pushdown through a volatile....

Executive Summary

This is a bug fix release for various issues discovered after we released v1.5.5 What's Changed Use relative includes in unity build sources for cache reuse by @NiclasHaderer in #23972 bump vortex by @samansmink in #24089 [variegata] Remove Julia client in favor of duckdb/DuckDB.jl by @evertlammerts in #24127 [variegata] Replace the C API spec and code generation by @evertlammerts in #24131 TopNWindowElimination Fixes by @d-justen in #24080 Fix active query race by @NiclasHaderer in #24123 Fix UNNEST Pushdown by @d-justen in #24119 [Parquet][Variant] Don't produce VARIANT metadata with sorted_strings set by @Tishj in #23591 Fix LIMIT pushdown through a volatile...

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