Bump TRT-LLM docker to 1.2.0rc4 (CUDA 13)

[kevalmorabia97]

What does this PR do?

Bump TRT-LLM docker from 1.1.0rc2.post2 (CUDA 12) to 1.2.0rc4 (CUDA 13)

Testing

• 2-gpu tests for all examples: ?

Before your PR is "Ready for review"

• Make sure you read and follow Contributor guidelines and your commits are signed.
• Is this change backward compatible?: Yes
• Did you write any new necessary tests?: No
• Did you add or update any necessary documentation?: Yes
• Did you update Changelog?: Yes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.64%. Comparing base (11728b7) to head (d65ce1c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #578   +/-   ##
=======================================
  Coverage   74.64%   74.64%           
=======================================
  Files         183      183           
  Lines       18547    18550    +3     
=======================================
+ Hits        13844    13847    +3     
  Misses       4703     4703           

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[h-guo18]

Speculative-decoding related scripts looks good to me after change