Update dependency ash_postgres to v2.6.15 (#1374)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

mix.lock

@@ -1,6 +1,6 @@
 %{
   "ash": {:hex, :ash, "3.5.34", "e79e82dc3e3e66fb54a598eeba5feca2d1c3af6a0e752a3378cbad8d7a47dc6f", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:ecto, "~> 3.7", [hex: :ecto, repo: "hexpm", optional: false]}, {:ets, "~> 0.8", [hex: :ets, repo: "hexpm", optional: false]}, {:igniter, ">= 0.6.4 and < 1.0.0-0", [hex: :igniter, repo: "hexpm", optional: true]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: false]}, {:picosat_elixir, "~> 0.2", [hex: :picosat_elixir, repo: "hexpm", optional: true]}, {:plug, ">= 0.0.0", [hex: :plug, repo: "hexpm", optional: true]}, {:reactor, "~> 0.11", [hex: :reactor, repo: "hexpm", optional: false]}, {:simple_sat, ">= 0.1.1 and < 1.0.0-0", [hex: :simple_sat, repo: "hexpm", optional: true]}, {:spark, ">= 2.2.65 and < 3.0.0-0", [hex: :spark, repo: "hexpm", optional: false]}, {:splode, ">= 0.2.6 and < 1.0.0-0", [hex: :splode, repo: "hexpm", optional: false]}, {:stream_data, "~> 1.0", [hex: :stream_data, repo: "hexpm", optional: false]}, {:telemetry, "~> 1.1", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "5cbf0a4d0ec1b6525b0782e4f5509c55dad446d657c635ceffe55f78a59132cd"},
-  "ash_postgres": {:hex, :ash_postgres, "2.6.14", "8085b25864c63029a546ec7191d111f348405cb9d3a90677e52d805576319b55", [:mix], [{:ash, ">= 3.5.13 and < 4.0.0-0", [hex: :ash, repo: "hexpm", optional: false]}, {:ash_sql, ">= 0.2.72 and < 1.0.0-0", [hex: :ash_sql, repo: "hexpm", optional: false]}, {:ecto, "~> 3.13", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "~> 3.13", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:igniter, ">= 0.6.14 and < 1.0.0-0", [hex: :igniter, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: false]}], "hexpm", "0230343b959fb9cd24f76d1ecdbba90045d9625f03b33170ecb7c9ef011c9ac2"},
+  "ash_postgres": {:hex, :ash_postgres, "2.6.15", "29898b86689925bf5733ecbdeee0da8bfffad7127acf1e5c0ca15071b1881bbe", [:mix], [{:ash, ">= 3.5.13 and < 4.0.0-0", [hex: :ash, repo: "hexpm", optional: false]}, {:ash_sql, ">= 0.2.72 and < 1.0.0-0", [hex: :ash_sql, repo: "hexpm", optional: false]}, {:ecto, "~> 3.13", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "~> 3.13", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:igniter, ">= 0.6.14 and < 1.0.0-0", [hex: :igniter, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: false]}], "hexpm", "4298266c7bf6c621abc51d5ee8174b9f63c73fb9b2eda3812b91da5d8168b8d1"},
   "ash_sql": {:hex, :ash_sql, "0.2.89", "ad4ad497263b586a7f3949ceea5d44620a36cb99a1ef0ff5f58f13a77d9b99ef", [:mix], [{:ash, ">= 3.5.25 and < 4.0.0-0", [hex: :ash, repo: "hexpm", optional: false]}, {:ecto, "~> 3.9", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "~> 3.9", [hex: :ecto_sql, repo: "hexpm", optional: false]}], "hexpm", "bd957aee95bbdf6326fc7a9212f9a2ab87329b99ee3646c373a87bb3c9968566"},
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
   "castore": {:hex, :castore, "1.0.14", "4582dd7d630b48cf5e1ca8d3d42494db51e406b7ba704e81fbd401866366896a", [:mix], [], "hexpm", "7bc1b65249d31701393edaaac18ec8398d8974d52c647b7904d01b964137b9f4"},