fix: add border-inline-width

Author: Yosevu Kilonzo

components/inlinealert/index.css

@@ -43,6 +43,7 @@ governing permissions and limitations under the License.
   padding-inline: var(--mod-inlinealert-spacing-edge-to-text, var(--spectrum-inlinealert-spacing-edge-to-text));
 
   border-block-width: var(--mod-inlinealert-border-width, var(--spectrum-inlinealert-border-width));
+  border-inline-width: var(--mod-inlinealert-border-width, var(--spectrum-inlinealert-border-width));
   border-style: solid;
   border-radius: var(--mod-inlinealert-border-radius, var(--spectrum-inlinealert-border-radius));