Fix pipelines - Update mlc version in dockerfiles from v3.11 to v3.12

[WenqingLan1]

Updated mlc wget link in dockerfiles.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.71%. Comparing base (1b4377f) to head (1832657).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #752   +/-   ##
=======================================
  Coverage   85.71%   85.71%           
=======================================
  Files         102      102           
  Lines        7678     7678           
=======================================
  Hits         6581     6581           
  Misses       1097     1097           

Flag	Coverage Δ
cpu-python3.10-unit-test	70.94% <ø> (ø)
cpu-python3.12-unit-test	70.94% <ø> (ø)
cpu-python3.7-unit-test	70.39% <ø> (ø)
cuda-unit-test	83.61% <ø> (ø)

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[guoshzhao]

Could you please test this benchmark before we merge this PR?

[guoshzhao]

Please update the version info in the header comment like:

Intel:

- mlc: v3.11