fix(checkver) use Start-Job for manifest script to not to exit on break

Invoke-Command will exit the parent process if a manifest script issues
a break command.  Use Start-Job to resolve this.

Fixes ScoopInstaller/GithubActions#32

CHANGELOG.md

@@ -7,6 +7,7 @@
 
 ### Bug Fixes
 
+- **checkver:** use Start-Job for manifest script to not to exit on break ([#32](https://github.com/ScoopInstaller/GithubActions/issues/32))
 - **decompress:** Exclude '*.nsis' that may cause error ([#5294](https://github.com/ScoopInstaller/Scoop/issues/5294))
 - **autoupdate:** Fix file hash extraction ([#5295](https://github.com/ScoopInstaller/Scoop/issues/5295))
 - **getopt:** Stop split arguments in `getopt()` and ensure array by explicit arguments type ([#5326](https://github.com/ScoopInstaller/Scoop/issues/5326))

bin/checkver.ps1

@@ -288,7 +288,8 @@ while ($in_progress -gt 0) {
             $page = (Get-Encoding($wc)).GetString($ev.SourceEventArgs.Result)
         }
         if ($script) {
-            $page = Invoke-Command ([scriptblock]::Create($script -join "`r`n"))
+            $page = Start-Job ([scriptblock]::Create($script -join "`r`n"))
+            Wait-Job $page | Out-Null
         }
 
         if ($jsonpath) {