[ci skip] clean up GitHub boilerplate

.github/scripts/update-version.sh

@@ -1,10 +0,0 @@
-if [ ! -z $(git diff --name-only HEAD HEAD~1 | grep build.gradle) ]; then
-  new_version="$(git log -n1 --format=format:"%H")"
-  sed --in-place "s!^//version:.*!//version: $new_version!g" build.gradle
-  git add build.gradle
-  git commit -m "[ci skip] update build script version to $new_version"
-  git push
-  echo "Updated buildscript version to $new_version"; 
-else
-  echo "Ignored buildscript version update: no changes detected"
-fi