Bump ats-2 default env to newer tools.

[KineticTheory]

Background

• Bump default developer environment for ATS-2 to xl/2021.03.11 and cuda-11.2.0.

Purpose of Pull Request

• Fixes Redmine Issue #2395

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • Travis/Appveyor CI checks pass
  • Code coverage does not decrease
  • Valgrind test passes
  • Toss3 checks pass
  • Trinitite checks pass
  • Code reviewed/approved, sufficient DbC checks, testing, documentation

[codecov]

Codecov Report

Merging #1052 (aac8727) into develop (a6b720f) will not change coverage.
The diff coverage is n/a.

❗ Current head aac8727 differs from pull request most recent head fbbe26d. Consider uploading reports for the commit fbbe26d to get more accurate results

@@           Coverage Diff           @@
##           develop   #1052   +/-   ##
=======================================
  Coverage     94.0%   94.0%           
=======================================
  Files          368     368           
  Lines        17461   17461           
=======================================
  Hits         16423   16423           
  Misses        1038    1038