Update GitHub Actions workflows. (#595)

This PR was automatically generated by the
update-workflows-single-bridged-provider workflow in the pulumi/ci-mgmt
repo, from commit 4125efba3dbbc633190a388a9f8b0408d755089c.

.github/actions/esc-action/index.js

@@ -5,7 +5,7 @@ var stream = fs.createWriteStream(file, { flags: "a" });
 
 for (const [name, value] of Object.entries(process.env)) {
   try {
-    stream.write(`${name}=${value}\n`);
+    stream.write(`${name}<<EEEOOOFFF\n${value}\nEEEOOOFFF\n`); // << syntax accommodates multiline strings.
   } catch (err) {
     console.log(`error: failed to set output for ${name}: ${err.message}`);
   }