Proposed 2.1.1

[seelabs]

High Level Overview of Change

This is a hotfix release that fixes a critical bug when handling of a large synthetic AMM offers in the payment engine.

Type of Change

• [ x] Bug fix (non-breaking change which fixes an issue)
• [ x] Release

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 39.62264% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 61.49%. Comparing base (d7d15a9) to head (42e41cf).

:exclamation: Current head 42e41cf differs from pull request most recent head 561bc7a. Consider uploading reports for the commit 561bc7a to get more accurate results

Files	Patch %	Lines
src/ripple/app/paths/impl/AMMOffer.cpp	37.03%	15 Missing and 2 partials :warning:
src/ripple/app/paths/impl/AMMLiquidity.cpp	45.00%	8 Missing and 3 partials :warning:
src/ripple/app/paths/impl/BookStep.cpp	0.00%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4968 +/- ## ========================================== - Coverage 61.53% 61.49% -0.04% ========================================== Files 797 797 Lines 70158 70199 +41 Branches 36261 36287 +26 ========================================== + Hits 43170 43171 +1 - Misses 19753 19779 +26 - Partials 7235 7249 +14 ```

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