Update ExprTk

[codecov[bot]]

Codecov Report

Merging #1265 (8f8943c) into develop (76c4ce9) will decrease coverage by 0.01%. The diff coverage is n/a.

:exclamation: Current head 8f8943c differs from pull request most recent head f26f20c. Consider uploading reports for the commit f26f20c to get more accurate results

@@             Coverage Diff             @@
##           develop    #1265      +/-   ##
===========================================
- Coverage    39.08%   39.08%   -0.01%     
===========================================
  Files         1258     1258              
  Lines       109174   109293     +119     
===========================================
+ Hits         42673    42717      +44     
- Misses       66501    66576      +75     

Impacted Files	Coverage Δ
libs/expr/include/mrpt/3rdparty/exprtk.hpp	29.02% <ø> (+0.10%)	:arrow_up:
libs/math/src/CSparse/cs_multiply.c	93.75% <0.00%> (-0.37%)	:arrow_down:
libs/core/src/WorkerThreadsPool.cpp	82.85% <0.00%> (+0.50%)	:arrow_up:

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[ArashPartow]

@jlblancoc seems like this might be a spurious build error:

Errors were encountered while processing: /var/cache/apt/archives/firefox_1%3a1snap1-0ubuntu2_amd64.deb needrestart is being skipped since dpkg has failed

not sure how to trigger a rebuild for the CI Linux / ubuntu-latest-clang Release pipeline

[jlblancoc]

Yes, it seems a spurious error. Thanks!