Add width and height props to no-system-props for ConfirmationDialog (#435)

* Add width and height props to `no-system-props` for `ConfirmationDialog`

Adds the `width` and `height` props to the `no-system-props` rule for the `ConfirmationDialog` component.

* Add changeset

Author: TylerJDev

.changeset/dark-parents-kiss.md

@@ -0,0 +1,5 @@
+---
+'eslint-plugin-primer-react': patch
+---
+
+Adds `width` and `height` to `no-system-props` for `ConfirmationDialog`

src/rules/no-system-props.js

@@ -24,6 +24,7 @@ const excludedComponentProps = new Map([
   ['Breadcrumbs', new Set(['overflow'])],
   ['Button', new Set(['alignContent'])],
   ['CircleOcticon', new Set(['size'])],
+  ['ConfirmationDialog', new Set(['width', 'height'])],
   ['Dialog', new Set(['width', 'height', 'position'])],
   ['IssueLabelToken', new Set(['size'])],
   ['Overlay', new Set(['width', 'height', 'maxHeight', 'position', 'top', 'right', 'bottom', 'left'])],