Update config.yml

Neurodebian has stopped serving Trusty sources.

Author: oesteban

.circleci/config.yml

@@ -56,7 +56,7 @@ jobs:
           name: Setup git-annex
           command: |
             if [[ ! -d /usr/lib/git-annex.linux ]]; then
-              wget -O- http://neuro.debian.net/lists/trusty.us-ca.full | tee /etc/apt/sources.list.d/neurodebian.sources.list
+              wget -O- http://neuro.debian.net/lists/focal.us-ca.full | tee /etc/apt/sources.list.d/neurodebian.sources.list
               apt-key adv --recv-keys --keyserver hkp://pool.sks-keyservers.net:80 0xA5D32F012649A5A9
               apt update && apt-get install -y --no-install-recommends git-annex-standalone
             fi