Remove Bundler 1.17.3 bundling by updating Bundler software to 2.x

What does this MR do?

Remove Bundler 1.17.3 bundling by updates Bundler software to 2.x.

LICENSE for Bundler is updated (upstream diff: https://github.com/rubygems/bundler/commit/162159575153ecb51af93ffc6b9dadf228cdc1bd):

• Before: https://github.com/rubygems/bundler/blob/v1.16.2/LICENSE.md
• After: https://github.com/rubygems/bundler/blob/v2.1.4/LICENSE.md

bundler/bundler repo was renamed as rubygems/bundler by transferring, and then integrated into rubygems/rubygems. bundler is now released with bundler-vX.Y.Z tags since 2.2.

Reverts 317db579 to remove a patch for Bundler < 2.1.0. See rubygems/bundler#6501 (or PR:rubygems/bundler#7416).

Related issues

n/a

Checklist

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Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
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