ifort deprecation

[spco]

More a warning/placeholder for the future than an issue per se. ifort is being dperecated and replaced by ifx. Discontinuation is late 2024, so from that point on there will be no new ifort versions released.

Filtering that change thru the HPC infrastructure may take a while longer, but we should look to start testing against ifx if possible to check for any issues.

Details of the deprecation notice: https://community.intel.com/t5/Blogs/Tech-Innovation/Tools/Deprecation-of-The-Intel-Fortran-Compiler-Classic-ifort/post/1541699

ifort-to-ifx Porting Guide: https://www.intel.com/content/www/us/en/developer/articles/guide/porting-guide-for-ifort-to-ifx.html