chore: bump embedded PostgreSQL 18 to 18.3.0

[tianzhou]

Upgrades fergusstrange/embedded-postgres v1.33.0 → v1.34.0. I diffed the two library releases: the only code change is the V18 binary pin moving from 18.0.0 to 18.3.0 — the V14–V17 pins are untouched, so older-version test runs are unaffected.

Also updated:

• -- Dumped from database version PostgreSQL 18.0 → 18.3 in the dump fixture headers (cosmetic — the dump tests normalize these lines away, but the fixtures stay honest)
• The v1.33.0 references in CLAUDE.md

Testing (all against the new 18.3.0 binaries)

• Full dump suite (TestDumpCommand, all 18 suites)
• Full internal/diff suite
• Full internal/plan suite
• online/ integration tests (TestPlanAndApply), which exercise the PG18 native NOT NULL ... NOT VALID path from feat: use native NOT NULL NOT VALID constraints on PostgreSQL 18+ #566 on 18.3

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

Updates fergusstrange/embedded-postgres from v1.33.0 to v1.34.0, moving PostgreSQL 18 test and planning environments to 18.3.

• Refreshes module checksums and dependency documentation.
• Updates generated dump fixture headers from PostgreSQL 18.0 to 18.3.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code defect identified in the dependency bump, documentation, or fixture updates.

The dependency manifest and checksums consistently upgrade embedded PostgreSQL, while the remaining changes accurately synchronize documentation and cosmetic PostgreSQL dump headers.

Important Files Changed

Filename	Overview
go.mod	Updates only the direct embedded-postgres dependency from v1.33.0 to v1.34.0; no actionable compatibility or security regression was established.
go.sum	Replaces the embedded-postgres module checksums consistently with the go.mod upgrade.
CLAUDE.md	Keeps both embedded-postgres version references synchronized with the dependency manifest.
testdata/dump/employee/pgschema.sql	Representative fixture change updates only the normalized dump header to PostgreSQL 18.3; the same cosmetic update is applied consistently across the affected fixtures.

_{Reviews (1): Last reviewed commit: "chore: bump embedded PostgreSQL 18 to 18..." | Re-trigger Greptile}

[Copilot]

Pull request overview

This PR updates the project’s embedded PostgreSQL dependency to pick up the newer PostgreSQL 18.3.0 embedded binaries, and aligns documentation + dump fixtures to match the new reported server version string.

Changes:

• Bump github.com/fergusstrange/embedded-postgres from v1.33.0 to v1.34.0 (Go module + sums).
• Update PG18 dump fixture headers from PostgreSQL 18.0 to PostgreSQL 18.3.
• Refresh CLAUDE.md references to the embedded-postgres version.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
testdata/dump/tenant/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/sakila/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_472_partition_clone_trigger/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_420_varchar_array_length_modifier/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_412_unique_nulls_not_distinct/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_396_check_constraint_is_not_null/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_345_array_cast/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_320_plpgsql_reserved_keyword_type/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_307_view_dependency_order/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_275_truncated_function_grants/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_252_function_schema_qualifier/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_191_function_procedure_overload/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/issue_125_function_default/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
testdata/dump/employee/pgschema.sql	Update fixture header to reflect PostgreSQL 18.3.
go.mod	Bump embedded-postgres requirement to v1.34.0.
go.sum	Update module sums for embedded-postgres v1.34.0.
CLAUDE.md	Update documentation references to embedded-postgres v1.34.0.

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