the overwritten binstub in the test has a final new line that makes it
not match "OMG" exactly from the beginning, that's why the test passes,
but `bintubs` command without `--force` flag is not supposed to update
the binstub.

This change fixes the test to test what's supposed to update the
binstub, and also fixes the assertion that that it will fail in the
future if `--force` stops updating the binstub.

https://github.com/rubygems/rubygems/commit/dfc9023337

https://github.com/rubygems/rubygems/commit/bb66253f2c

This is in preparation for deprecating source-less gemfiles.

https://github.com/rubygems/rubygems/commit/d6493fa3e2

Since our helpers now raise by default if the subcommand fails, these
will never actually fail and are not necessary.

https://github.com/rubygems/rubygems/commit/6153b9321e

Using File.open without a block leaves a file reference that causes issues with file operations

commands/binstubs_spec.rb
install/gems/compact_index_spec.rb
install/gems/dependency_api_spec.rb
install/gems/standalone_spec.rb
runtime/executable_spec.rb

https://github.com/rubygems/rubygems/commit/4b9a6ca156

https://github.com/rubygems/rubygems/commit/4d1a0c465a

https://github.com/rubygems/rubygems/commit/746a4b3d74