Update dependency ash_postgres to v2.4.20

[renovate]

This PR contains the following updates:

Package	Update	Change
ash_postgres (source)	patch	2.4.12 -> 2.4.20

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Release Notes

ash-project/ash_postgres (ash_postgres)

v2.4.20

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Bug Fixes:

• use passed in version of postgres when modifying existing repo

v2.4.19

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Bug Fixes:

• ensure there is always at least one upsert field so filter is run

Improvements:

• better min_pg_version when modifying a repo

• automatically set min_pg_version where possible

• use a notice to suggest configuring min_pg_version

v2.4.18

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Bug Fixes:

• handle double select issue

Improvements:

• make igniter optional

• make tsvector type selectable

v2.4.17

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Bug Fixes:

• Fix query for metadata on foreign keys and fix duplicate references being produced (#​444)

• alter resource generation query to go to the source pg_constraints table instead of to the view to fetch constraint data (#​443)

v2.4.16

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Bug Fixes:

• properly support expr errors in bulk create

• only build references for belongs_to relationships

Improvements:

• add postgres_reference_expr callback (#​438)

v2.4.15

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Bug Fixes:

• split off varchar options from index

• don't attempt to use non-existent relationship

• handle manual/no_attributes? relationships in lateral join logic

• don't use priv configuration for snapshot_path

Improvements:

• update sql implementation for type determination

v2.4.14

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Bug Fixes:

• pass AST to deal with stupid igniter behavior

v2.4.13

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Bug Fixes:

• [mix ash.migrate] honor the snapshots_only option

Improvements:

• [mix ash.migrate] honor repo configuration in migration generator

• [mix ash.codegen] honor :priv in migration generator, and make it explicitly configurable

• [mix ash_postgres.install] don't generate task aliases that run seeds in test

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