chore(ci): try yarn rw upgrade -t canary instead of npx@canary (#10177

)

#10176 didn't work, but I did
discover that the SSR test project seems to always be one canary behind
and completes successfully:
#10176 (comment).
It uses `yarn rw upgrade`. Let's see if that works for RSC too.

.github/actions/set-up-rsc-project/setUpRscProject.mjs

@@ -76,14 +76,15 @@ async function setUpRscProject(
 
   console.log(`Creating project at ${rscProjectPath}`)
   console.log()
-  await exec('npx', [
-    '-y',
-    'create-redwood-app@canary',
+  await exec('yarn', [
+    'create',
+    'redwood-app',
     '-y',
     '--no-git',
     rscProjectPath,
   ])
-  await execInProject('yarn')
+  await execInProject('yarn install')
+  await execInProject('yarn rw upgrade -t canary')
 
   console.log(`Setting up Streaming/SSR in ${rscProjectPath}`)
   const cmdSetupStreamingSSR = `node ${rwBinPath} experimental setup-streaming-ssr -f`