Change exitcode to string

Author: Maddog2050

dist/index.js

@@ -2962,7 +2962,7 @@ async function run() {
 
   core.setOutput('stdout', stdout.contents);
   core.setOutput('stderr', stderr.contents);
-  core.setOutput('exitcode', exitCode);
+  core.setOutput('exitcode', exitCode.toString(10));
 
   if (exitCode !== 0) {
     core.setFailed(`Program exited with code ${exitCode}.`);

src/run-wrapper.js

@@ -41,7 +41,7 @@ async function run() {
 
   core.setOutput('stdout', stdout.contents);
   core.setOutput('stderr', stderr.contents);
-  core.setOutput('exitcode', exitCode);
+  core.setOutput('exitcode', exitCode.toString(10));
 
   if (exitCode !== 0) {
     core.setFailed(`Program exited with code ${exitCode}.`);