Update changelogs from fern repo (#5587)

fern-support · dsinghvi · web-flow · commit 22d6b2a3d3a8 · 2026-05-21T13:26:19.000-04:00
Co-authored-by: dsinghvi &lt;10870189+dsinghvi@users.noreply.github.com&gt;
diff --git a/fern/products/sdks/generators/csharp/changelog/2026-05-21.mdx b/fern/products/sdks/generators/csharp/changelog/2026-05-21.mdx
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+## 2.66.6
+**`(fix):`** `MockServerTestGenerator` now normalizes nullable date-time query and header parameters to millisecond precision, matching the fix previously applied to `MockEndpointGenerator`. Without this, mock-server tests for nullable date-time fields emitted matchers like `"2024-01-15T09:30:00Z"` while the SDK actually sent `"2024-01-15T09:30:00.000Z"`.
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diff --git a/fern/products/sdks/generators/go/changelog/2026-05-21.mdx b/fern/products/sdks/generators/go/changelog/2026-05-21.mdx
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+## 1.42.2
+**`(fix):`** Generated `wiremock-mappings.json` now matches nullable date-time query and header parameters with millisecond precision so the stub matches what the Go SDK actually sends. Previously, when a date-time field was wrapped in a nullable container (e.g. with `respect-nullable-schemas: true` and `coerce-optional-schemas-to-nullable: true`), the stub matcher used `"2024-01-15T09:30:00Z"` while the SDK serialized `"2024-01-15T09:30:00.000Z"`, causing WireMock to return 404.
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 +## 2.66.6
 +**`(fix):`** `MockServerTestGenerator` now normalizes nullable date-time query and header parameters to millisecond precision, matching the fix previously applied to `MockEndpointGenerator`. Without this, mock-server tests for nullable date-time fields emitted matchers like `"2024-01-15T09:30:00Z"` while the SDK actually sent `"2024-01-15T09:30:00.000Z"`.
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