Remove unecessary changes to CI scripts

tests/utils/shippable/linux.sh

@@ -6,15 +6,6 @@ declare -a args
 IFS='/:' read -ra args <<< "$1"
 
 image="${args[1]}"
-pyver=default
-# check for explicit python version like 8.3@3.8
-declare -a splitversion
-IFS='@' read -ra splitversion <<< "$image"
-
-if [ "${#splitversion[@]}" -gt 1 ]; then
-    image="${splitversion[0]}"
-    pyver="${splitversion[1]}"
-fi
 
 if [ "${#args[@]}" -gt 2 ]; then
     target="shippable/posix/group${args[2]}/"
@@ -24,4 +15,4 @@ fi
 
 # shellcheck disable=SC2086
 ansible-test integration --color -v --retry-on-error "${target}" ${COVERAGE:+"$COVERAGE"} ${CHANGED:+"$CHANGED"} ${UNSTABLE:+"$UNSTABLE"} \
-    --docker "${image}" --python "${pyver}"
+    --docker "${image}"