Update NMODL submodule to latest master

[iomaganaris]

No description provided.

[azure-pipelines]

✔️ 8008553 -> Azure artifacts URL

[codecov]

Codecov Report

Merging #2523 (8008553) into master (b38dd11) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2523      +/-   ##
==========================================
- Coverage   61.49%   61.49%   -0.01%     
==========================================
  Files         624      624              
  Lines      119255   119256       +1     
==========================================
- Hits        73337    73336       -1     
- Misses      45918    45920       +2     

see 4 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[bbpbuildbot]

Logfiles from GitLab pipeline #154752 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ✅ test:neuron:nmodl:nvhpc:acc:legacy
• ✅ test:neuron:nmodl:nvhpc:acc:shared
• ✅ test:neuron:nmodl:nvhpc:omp:legacy
• ✅ test:neuron:nmodl:nvhpc:omp