Ignore apt-get 404 errors that were breaking CI for Ruby < 2.3 (#2124)

.circleci/config.yml

@@ -39,8 +39,8 @@ commands:
           name: Install OpenSSH 8.1p1 if necessary
           command: |
             if $(ssh -V 2>&1 | grep -q -v OpenSSH_8); then
-              apt-get update
-              apt-get install -y --force-yes libssl-dev
+              apt-get update || true
+              apt-get install -y --force-yes libssl-dev || true
               mkdir ~/tempdownload
               cd ~/tempdownload
               wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.1p1.tar.gz