fix: Extension OIDs in the correct range for dumping with pg_dump

[samwillis]

related to issue #352

[github-actions[bot]]

Built bundles:

• Postgres WASM: https://github.com/electric-sql/pglite/actions/runs/11072062322/artifacts/1987722214
• Interim build files: https://github.com/electric-sql/pglite/actions/runs/11072062322/artifacts/1987722305
• PGlite: https://github.com/electric-sql/pglite/actions/runs/11072062322/artifacts/1987749991
• Demos: https://github.com/electric-sql/pglite/actions/runs/11072062322/artifacts/1987764763

[github-actions[bot]]

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