Remove target/.rustc_info.json before caching on CI

Author: jtgeibel

script/ci/prune-cache.sh

@@ -25,6 +25,8 @@ for name in $bin_names; do
     rm -v target/debug/deps/$normalized-*
 done
 
+rm -v target/.rustc_info.json
+
 echo "Removing target/debug/incremental/"
 rm -rf target/debug/incremental/