Do more retries and reduce download limits for APT five times

We get snapshots of debian banning us while installing packages.
This is an attempt to go even slower in hopes to eliviate such bans

.github/workflows/tools/containers/buildenv-git-annex/Dockerfile

@@ -4,9 +4,9 @@ FROM neurodebian:bookworm
 # provide some apt conf tune ups with hope to make apt more robust in talking to it
 # see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=959518  for more info
 # (later apt as now in sid should be more robust)
-RUN echo 'Acquire::http::Dl-Limit "1000";' >| /etc/apt/apt.conf.d/20snapshots \
-    && echo 'Acquire::https::Dl-Limit "1000";' >> /etc/apt/apt.conf.d/20snapshots \
-    && echo 'Acquire::Retries "5";' >> /etc/apt/apt.conf.d/20snapshots
+RUN echo 'Acquire::http::Dl-Limit "200";' >| /etc/apt/apt.conf.d/20snapshots \
+    && echo 'Acquire::https::Dl-Limit "200";' >> /etc/apt/apt.conf.d/20snapshots \
+    && echo 'Acquire::Retries "10";' >> /etc/apt/apt.conf.d/20snapshots
 
 # Notes:
 # - in APT for NeuroDebian we have #deb-src  for debian-devel, so we need to change