message: fix(ci): install mlaunch without pip cache
diff: @@ -125,7 +125,7 @@ export async function getMlaunchPath(): Promise<{ exec: string[], env: Record<st
  // with 4.0, see https://jira.mongodb.org/browse/MONGOSH-1072
  // Also pin mlaunch to 1.6.4, since we have Python 3.6 in CI and 1.7.0
  // drops Python 3.6 support.
  - await execFile('pip3', ['install', '--target', tmpdir, 'mtools[mlaunch]==1.6.4', 'pymongo==3.12.2']);
  + await execFile('pip3', ['install', '--no-cache-dir', '--target', tmpdir, 'mtools[mlaunch]==1.6.4', 'pymongo==3.12.2']);
  ciLog('Installation complete');
  [ exec ] = await tryExtensions(mlaunchPy);
  if (exec) {
  @@ -145,7 +145,7 @@ export async function getMlaunchPath(): Promise<{ exec: string[], env: Record<st
  }
  }
  ciLog('Trying to install mlaunch in ', { pythonBase, pythonPath });
  - await execFile('pip3', ['install', '--user', 'mtools[mlaunch]']);
  + await execFile('pip3', ['install', '--no-cache-dir', '--user', 'mtools[mlaunch]']);
  ciLog('Installation complete');
  const [ exec, lastErr ] = await tryExtensions(mlaunchExec);
  if (exec) {
  