docs: release notes for 2.1.0

planning/releases/2.1.0.md

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+# modern-di-pytest 2.1.0 — adopt modern-di's resolve_dependency seam
+
+A maintenance release. No public API changes — `expose` and `modern_di_fixture`
+keep the same signatures and behavior.
+
+## Internal refactors
+
+- **`modern_di_fixture` delegates to `container.resolve_dependency`.** The
+  inline `isinstance(dependency, AbstractProvider)` dispatch — `resolve_provider`
+  for a Provider, `resolve` for a type — is now `container.resolve_dependency(dependency)`,
+  the single provider-or-type entry point modern-di 2.25 added for integrations
+  (`add_providers`/`resolve_dependency`, [modern-python/modern-di#283](https://github.com/modern-python/modern-di/pull/283)).
+  Overrides, caching, scope checks, and "did you mean" suggestions behave
+  exactly as before.
+- The `modern-di` floor is bumped to `>=2.25,<3` accordingly. This plugin never
+  reached into `container.providers_registry`, so the sibling `add_providers`
+  seam does not apply here.
+
+## Downstream
+
+Upgrade `modern-di` to `>=2.25` (or let this bump pull it in). No code changes
+needed — the fixture and `expose()` contracts are unchanged.