chore: added changeset

Author: GarthDB

.changeset/spicy-days-fetch.md

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+---
+"@adobe/spectrum-tokens": minor
+---
+
+Updated popover border colors:
+
+popover-border-color: transparent-white-25 (light theme)
+popover-border-color: gray-400 (dark theme)
+
+## Design Motivation
+
+We've received feedback from Adobe Concept (Kelly Hurlburt) that `1px` `gray-200` border in dark theme doesn't provide sufficient visual contrast when used on `background-color-layer-2`.
+
+## Token Diff
+
+Updated (1)
+
+`popover-border-color`:
+
+- `schema`: `alias.json` -> `color-set.json`
+- `value`: `gray-200` ->
+  - `light.value`: `transparent-white-25`
+  - `dark.value`: `gray-400`