Update PostgreSQL backend is_postgresql_* properties for Django 5.1 (#2566)

Various commits upstream removed and added these properties, e.g. django/django@81ccf92. This PR syncs them to match the state of Django 5.1:

https://github.com/django/django/blob/8cb8820fbfbf2da4ebcae5f784cea3a0939d5639/django/db/backends/postgresql/features.py#L155-L165

Author: adamchainz

django-stubs/db/backends/postgresql/features.pyi

@@ -45,13 +45,11 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     has_json_operators: bool
     json_key_contains_list_matching_requires_list: bool
     @property
-    def is_postgresql_10(self) -> bool: ...
+    def is_postgresql_14(self) -> bool: ...
     @property
-    def is_postgresql_11(self) -> bool: ...
-    @property
-    def is_postgresql_12(self) -> bool: ...
+    def is_postgresql_15(self) -> bool: ...
     @cached_property
-    def is_postgresql_13(self) -> bool: ...
+    def is_postgresql_16(self) -> bool: ...
     has_brin_autosummarize: bool
     has_websearch_to_tsquery: bool
     supports_table_partitions: bool

scripts/stubtest/allowlist.txt

@@ -271,7 +271,9 @@ django.db.backends.mysql.features.DatabaseFeatures.update_can_self_select
 django.db.backends.oracle.features.DatabaseFeatures.supports_boolean_expr_in_select_clause
 django.db.backends.oracle.features.DatabaseFeatures.supports_frame_exclusion
 django.db.backends.postgresql.base.DatabaseWrapper.pg_version
-django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_13
+django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_14
+django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_15
+django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_16
 django.db.migrations.RenameField.new_name_lower
 django.db.migrations.RenameField.old_name_lower
 django.db.migrations.RenameIndex.new_name_lower

scripts/stubtest/allowlist_todo.txt

@@ -530,10 +530,6 @@ django.db.backends.postgresql.base.psycopg_version
 django.db.backends.postgresql.features.DatabaseFeatures.django_test_expected_failures
 django.db.backends.postgresql.features.DatabaseFeatures.has_bit_xor
 django.db.backends.postgresql.features.DatabaseFeatures.introspected_field_types
-django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_10
-django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_11
-django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_12
-django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_14
 django.db.backends.postgresql.features.DatabaseFeatures.prohibits_null_characters_in_text_exception
 django.db.backends.postgresql.features.DatabaseFeatures.supports_covering_spgist_indexes
 django.db.backends.postgresql.features.DatabaseFeatures.uses_server_side_binding

scripts/stubtest/allowlist_todo_django51.txt

@@ -45,7 +45,6 @@ django.db.backends.oracle.features.DatabaseFeatures.supports_comparing_boolean_e
 django.db.backends.postgresql.base.DatabaseWrapper.close_pool
 django.db.backends.postgresql.base.DatabaseWrapper.pool
 django.db.backends.postgresql.features.DatabaseFeatures.django_test_skips
-django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_16
 django.db.backends.sqlite3.base.DatabaseWrapper.transaction_modes
 django.db.migrations.autodetector.MigrationAutodetector.generate_altered_index_together
 django.db.migrations.autodetector.OperationDependency
@@ -78,7 +77,6 @@ django.db.backends.mysql.features.DatabaseFeatures.supports_expression_defaults
 django.db.backends.oracle.features.DatabaseFeatures.supports_primitives_in_json_field
 django.db.backends.oracle.features.DatabaseFeatures.test_collations
 django.db.backends.oracle.oracledb_any
-django.db.backends.postgresql.features.DatabaseFeatures.is_postgresql_15
 django.db.backends.postgresql.features.DatabaseFeatures.supports_nulls_distinct_unique_constraints
 django.db.backends.postgresql.psycopg_any
 django.db.backends.sqlite3.schema.DatabaseSchemaEditor.sql_alter_column_comment