DST Root CA X3 expiration fix

### PROBLEM ###
# debian@beaglebone:~$ sudo /opt/scripts/tools/update_kernel.sh
# [sudo] password for debian:
# info: checking archive
# ERROR: The certificate of ‘rcn-ee.com’ is not trusted.
# ERROR: The certificate of ‘rcn-ee.com’ has expired.


#### ROOT CAUSE ###
# https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/


### SOLUTION 1: remove the expired root certificate ###
sudo sed -i -e 's:^mozilla/DST_Root_CA_X3:!&:' /etc/ca-certificates.conf
sudo update-ca-certificates


### SOLUTION 2: update the misbehaving SSL libraries ###
sudo apt update
sudo apt install --upgrade --yes libssl1.1 libgnutls30