Python-Setup: run auto_install_packages.py with -B flag

This avoids creating a __pycache__ folder in the _actions folder, which
may cause file ownership problems on self-hosted runners
when run in a docker container.

src/init.ts

@@ -253,11 +253,14 @@ export async function installPythonDeps(codeql: CodeQL, logger: Logger) {
     if (process.platform === "win32") {
       await new toolrunner.ToolRunner(await safeWhich.safeWhich("py"), [
         "-3",
+        "-B",
         path.join(scriptsFolder, script),
         path.dirname(codeql.getPath()),
       ]).exec();
     } else {
-      await new toolrunner.ToolRunner(path.join(scriptsFolder, script), [
+      await new toolrunner.ToolRunner(await safeWhich.safeWhich("python3"), [
+        "-B",
+        path.join(scriptsFolder, script),
         path.dirname(codeql.getPath()),
       ]).exec();
     }