chore: Update OpenAPI specs (#209)

Author: bdbyrne

.devrev/repo.yml

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+deployable: true

fern/apis/beta/changelog/2025-04-13.md

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+
+# API Changelog
+
+## Modified Endpoints
+
+### SLAs
+Added field `in_policy` to SLA metric target to indicate whether the metric is in the active SLA policy
+
+### Webhooks
+New event types added to webhook related endpoints:
+- `dashboard_created`
+- `dashboard_deleted`
+- `dashboard_updated`
+- `widget_created`
+- `widget_deleted`
+- `widget_updated`