bootstrap.sh: Force bundler version to match Gemfile.lock
bootstrap.sh: Force bundler version to match Gemfile.lock

Note: This avoids mismatch errors between System & vendor versions

Reference: https://web.archive.org/web/20211210062358/https://bundler.io/blog/2019/05/14/solutions-for-cant-find-gem-bundler-with-executable-bundle.html

trinitronx/sprout-wrap,trinitronx/sprout-wrap