Fix lint errors in .d.mts type declaration files

Author: mirka

packages/theme/src/esbuild-plugins/esbuild-ds-token-fallbacks.d.mts

@@ -1,4 +1,2 @@
-import type { Plugin } from 'esbuild';
-
-declare const plugin: Plugin;
+declare const plugin: import('esbuild').Plugin;
 export default plugin;

packages/theme/src/postcss-plugins/postcss-ds-token-fallbacks.d.mts

@@ -1,4 +1,2 @@
-import type { PluginCreator } from 'postcss';
-
-declare const plugin: PluginCreator<never>;
+declare const plugin: import('postcss').PluginCreator< never >;
 export default plugin;

packages/theme/src/vite-plugins/vite-ds-token-fallbacks.d.mts

@@ -1,4 +1,2 @@
-import type { Plugin } from 'vite';
-
-declare const plugin: () => Plugin;
+declare const plugin: () => import('vite').Plugin;
 export default plugin;