(Closes #1909) update to latest master of fparser

[arporter]

The latest fparser has additional symbol table functionality and support for some additional Fortran2008 features (particularly the mold argument to allocate).

[codecov[bot]]

Codecov Report

Base: 99.83% // Head: 99.83% // No change to project coverage :thumbsup:

Coverage data is based on head (495af8c) compared to base (9905b77). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1911   +/-   ##
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  Coverage   99.83%   99.83%           
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  Files         285      285           
  Lines       40867    40867           
=======================================
  Hits        40801    40801           
  Misses         66       66           

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[arporter]

I've discovered that fparser2 doesn't work when two optional parameters are supplied to allocate() since the match reverts to the F2003 one. Therefore I'm pausing this PR while I fix that (https://github.com/stfc/fparser/issues/298).

[arporter]

CI permitting this is ready for review. It just updates the fparser submodule and changes the GHA yml to make sure that the CI uses that version of fparser rather than a released version.