chore: use jextract.ps1 on windows

Author: ObserverOfTime

scripts/jextract.ps1

@@ -2,7 +2,7 @@ $package = 'io.github.treesitter.jtreesitter.internal'
 $output = "$($args[1])/generated-sources/jextract"
 $lib = "$($args[0])/core/lib"
 
-& jextract.bat `
+& jextract.ps1 `
     --include-struct TSInput `
     --include-struct TSInputEdit `
     --include-struct TSLogger `