CI: dist-x86_64-linux docker image does not build anymore

[hkratz]

# DEPLOY=1 ./src/ci/docker/run.sh dist-x86_64-linux
[...]
Step 16/37 : RUN ./build-binutils.sh
 ---> Running in 3eaaea3b7e5a
+ source shared.sh
+ VERSION=2.26.1
+ curl https://ftp.gnu.org/gnu/binutils/binutils-2.26.1.tar.bz2
+ tar xfj -
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html

Most likely related to the Let's Encrypt root CA expiration