buildx: test artifact signatures with v0.31.0-rc1

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

Author: crazy-max

__tests__/buildx/install.test.itg.ts

@@ -23,7 +23,7 @@ const maybe = !process.env.GITHUB_ACTIONS || (process.env.GITHUB_ACTIONS === 'tr
 
 maybe('download', () => {
   // prettier-ignore
-  test.each(['latest'])(
+  test.each(['v0.31.0-rc1'])(
     'install buildx %s', async (version) => {
       await expect((async () => {
         const install = new Install({