[PWGEM/Dilepton] update dimuonV1

[dsekihat]

[PWGEM/Dilepton] update dimuonV1

[github-actions]

O2 linter results: ❌ 40 errors, ⚠️ 75 warnings, 🔕 0 disabled

[alibuild]

Auto-approving on behalf of @dsekihat.

[alibuild]

Error while checking build/O2Physics/code-check for 52b8e8b at 2026-07-10 22:39:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 3 errors and 0 warnings.'
Found 3 errors and 0 warnings.
++ [[ 3 -gt 0 ]]
++ cat /sw/BUILD/a5e41621e7c30d3511c87d57f3d07191b27ef12d/O2Physics-code-check/errors.txt
PWGEM/Dilepton/Tasks/dimuonV1.cxx:80:72: error: no header providing "M_PI" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGEM/Dilepton/Tasks/dimuonV1.cxx:169:20: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGEM/Dilepton/Tasks/dimuonV1.cxx:198:3: error: use '= default' to define a trivial destructor [modernize-use-equals-default,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 3 -gt 0 ]]
++ exit 1
--

Full log here.