Clean up after v3.20.0
### Improvements
-- [codegen/go] - Do not generate unreferenced input types by default.
- [#7943](https://github.com/pulumi/pulumi/pull/7943)
-
-- [codegen/go] - Simplify the application of object defaults in generated SDKs.
- [#8539](https://github.com/pulumi/pulumi/pull/8539)
-
-- [codegen/{python,dotnet}] - Emit `pulumi-plugin.json` unconditionally.
- [#8527](https://github.com/pulumi/pulumi/pull/8527)
- [#8532](https://github.com/pulumi/pulumi/pull/8532)
-
-- [sdk/python] - Lookup Pulumi packages by searching for `pulumi-plugin.json`.
- Pulumi packages need not be prefixed by `pulumi-` anymore.
- [#8515](https://github.com/pulumi/pulumi/pull/8515)
-
-- [sdk/go] - Lookup packages by searching for `pulumi-plugin.json`.
- Pulumi packages need not be prefixed by `github.com/pulumi/pulumi-` anymore.
- [#8516](https://github.com/pulumi/pulumi/pull/8516)
-
-- [sdk/dotnet] - Lookup packages by searching for `pulumi-plugin.json`.
- Pulumi packages need not be prefixed by `Pulumi.` anymore.
- [#8517](https://github.com/pulumi/pulumi/pull/8517)
-
-- [sdk/go] - Emit `pulumi-plugin.json`
- [#8530](https://github.com/pulumi/pulumi/pull/8530)
-
-- [cli] - Always use locking in filestate backends. This feature was
- previously disabled by default and activated by setting the
- `PULUMI_SELF_MANAGED_STATE_LOCKING=1` environment variable.
- [#8565](https://github.com/pulumi/pulumi/pull/8565)
-
-- [{cli,auto}] - Exclude language plugins from `PULUMI_IGNORE_AMBIENT_PLUGINS`.
- [#8576](https://github.com/pulumi/pulumi/pull/8576)
-
-- [sdk/dotnet] - Fixes a rare race condition that sporadically caused
- NullReferenceException to be raised when constructing resources
- [#8495](https://github.com/pulumi/pulumi/pull/8495)
-
-- [cli] Log secret decryption events when a project uses the Pulumi Service and a 3rd party secrets provider
- [#8563](https://github.com/pulumi/pulumi/pull/8563)
-
-- [schema] Do not validate against the metaschema in ImportSpec. Clients that need to
- validate input schemas should use the BindSpec API instead.
- [#8543](https://github.com/pulumi/pulumi/pull/8543)
-
### Bug Fixes
-- [codegen/schema] - Error on type token names that are not allowed (schema.Name
- or specified in allowedPackageNames).
- [#8538](https://github.com/pulumi/pulumi/pull/8538)
- [#8558](https://github.com/pulumi/pulumi/pull/8558)
-
-- [codegen/go] - Fix `ElementType` for nested collection input and output types.
- [#8535](https://github.com/pulumi/pulumi/pull/8535)
-
-- [{codegen,sdk}/{python,dotnet,go}] - Use `pulumi-plugin.json` rather than `pulumiplugin.json`.
- [#8593](https://github.com/pulumi/pulumi/pull/8593)
