[SPI-1868]: upgrade python to 3.9.4

4 jobs for spi1868_python394 in 7 minutes and 21 seconds
latest
Status Name Job ID Coverage
  Test
passed cc7 #13161352

00:07:20

passed fedora30 #13161354

00:02:44

passed slc6 #13161351

00:05:39

passed ubuntu18 #13161353

00:03:23