chore: Update OpenAPI specs (#183)

Author: bdbyrne

fern/apis/beta/changelog/2025-03-27.md

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+
+# API Changelog
+
+## New Endpoints
+
+### SLAs
+- Added [`POST /sla-trackers.remove-metric`](/beta/api-reference/slas/sla-trackers-remove-metric) for removing SLA metrics from objects.
+
+## Modified Endpoints
+
+### Rev users
+- Endpoints [`POST /rev-users.link`](/beta/api-reference/rev-users/link-rev-user-to-rev-org) and [`POST /rev-users.unlink`](/beta/api-reference/rev-users/unlink-rev-user-from-rev-org) are deprecated and will be removed from future versions.