Increment 2.12.0-SNAPSHOT to 2.13.0-SNAPSHOT in BWC workflow

[vibrantvarun]

Description

Increase bwc version from 2.12.0-SNAPSHOT to 2.13.0-SNAPSHOT

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.11%. Comparing base (3eeb855) to head (73c4d0b).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1505      +/-   ##
============================================
+ Coverage     85.09%   85.11%   +0.01%     
- Complexity     1280     1281       +1     
============================================
  Files           168      168              
  Lines          5232     5232              
  Branches        495      495              
============================================
+ Hits           4452     4453       +1     
  Misses          572      572              
+ Partials        208      207       -1     

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-1505-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 e1a7cb7aa1a523cf75beba3446985a87682f4d2c
# Push it to GitHub
git push --set-upstream origin backport/backport-1505-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-1505-to-2.x.

[vibrantvarun]

We don't need backport PR because the version update is already done by #1470