Prepare release 2.15.0 - #930

Summary

• Bump version to 2.15.0

Changes since 2.14.1

Features

• Add PYDANTIC_SETTINGS_DEBUG for debugging settings sources (Add PYDANTIC_SETTINGS_DEBUG for debugging settings sources (#538) #906)
• Add debug logging for env_file and secret file resolution (Add debug logging for env_file and secret file resolution #913)
• Add support for showing environment variable names in CLI help text (Add support for showing environment variable names in CLI help text #860)
• Support Traversable for json/toml/yaml config file sources (Support Traversable for json/toml/yaml config file sources (#299) #902)
• Support case_sensitive in InitSettingsSource and config file sources (Support case_sensitive in InitSettingsSource and config file sources #900)
• Support using a table header as root when reading a TOML file (Support using a table header as root when reading a TOML file #882)
• Warn when using fields not fully resolved at instantiation (Warn when using fields not fully resolved at instantiation #901)
• GoogleSecretManagerSettingsSource: read project_id from previous sources (GoogleSecretManagerSettingsSource: read project_id from previous sources #878)

Fixes

• Raise ValidationError for non-JSON env values on strict fields (fix: raise ValidationError for non-JSON env values on strict fields #926)
• Treat Secret subclasses as non-complex fields (fix: treat Secret subclasses as non-complex fields (#716) #920)
• Read secret files as UTF-8 instead of the locale encoding (fix: read secret files as UTF-8 instead of the locale encoding #917)
• Coerce empty yaml_config_section to an empty mapping instead of crashing (fix: coerce empty yaml_config_section to an empty mapping instead of crashing #914)
• Fix dotenv extras being claimed by complex fields sharing a name prefix (Fix dotenv extras being claimed by complex fields sharing a name prefix #912)
• Parse enum names through nested annotations (fix: parse enum names through nested annotations #910)
• Apply case-insensitive field matching to optional nested models (Apply case-insensitive field matching to optional nested models (#903) #905)
• Fix AliasPath on nested model fields not decoding env values (Fix AliasPath on nested model fields not decoding env values (#670) #898)
• Fix loading env vars on Windows with case_sensitive=True (Fix loading env vars on Windows with case_sensitive=True #894)
• Prevent NestedSecretsSettingsSource from following symlinks outside secrets_dir (Prevent NestedSecretsSettingsSource from following symlinks outside secrets_dir #889)
• Don't complain about missing table headers in a TOML file that isn't there (Don't complain about missing table headers in a TOML file that isn't there #886)
• Skip partial update merging for discriminated union fields (Skip partial update merging for discriminated union fields #876)
• Move SecretsManagerClient type import under TYPE_CHECKING (fix: move SecretsManagerClient type import under TYPE_CHECKING #880)
• Skip list_secrets call when case_sensitive=True (Skip list_secrets call when case_sensitive=True #862)

Docs

• Document JSON parsing of complex env values + comma-separated recipe (docs: document JSON parsing of complex env values + comma-separated recipe #919)
• Recommend async settings loading pattern (docs: recommend async settings loading pattern #908)
• Add explicit callout for the case where the unprefixed value is in dotenv (Add explicit callout for the case where the unprefixed value is in dotenv #895)
• Clarify environment variable helper descriptions (docs: clarify environment variable helper descriptions #867)

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