changing the version to 2.18 as term-check fallback is merged to 2.x

[rajiv-kv]

Description

Change the version to 2.18 after backport #16059

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

✅ Gradle check result for 29f0a42: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.93%. Comparing base (d6bda7d) to head (29f0a42).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...rt/clustermanager/term/GetTermVersionResponse.java	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16062      +/-   ##
============================================
- Coverage     72.00%   71.93%   -0.08%     
+ Complexity    64399    64349      -50     
============================================
  Files          5281     5281              
  Lines        300997   300997              
  Branches      43479    43479              
============================================
- Hits         216742   216522     -220     
- Misses        66449    66707     +258     
+ Partials      17806    17768      -38     

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