Removed py37 and py38 from macports CI

[Iximiel]

Description

In #967, related to the EOL of python3.7, I lost the "py37" in the macports-CI, here I removed it

Type of contribution

• [x] changes to code or doc authored by PLUMED developers, or additions of code in the core or within the default modules
• [ ] changes to a module not authored by you
• [ ] new module contribution or edit of a module authored by you

Copyright

• [x] I agree to transfer the copyright of the code I have written to the PLUMED developers or to the author of the code I am modifying.

• [ ] the module I added or modified contains a COPYRIGHT file with the correct license information. Code should be released under an open source license. I also used the command cd src && ./header.sh mymodulename in order to make sure the headers of the module are correct.

Tests

• [ ] I added a new regtest or modified an existing regtest to validate my changes.
• [ ] I verified that all regtests are passed successfully on GitHub Actions.

[Iximiel]

Tests were failing not due to the EOL of 3.7 the error message says:

Error: Processing of port py38-plumed failed ---> Some of the ports you installed have notes: OpenBLAS has the following notes: This version is built based on a base architecture for convenience, which may not be optimized for your system. To build a version customized for your machine, use the +native variant py38-pytest has the following notes: To make the Python 3.8 version of pytest the one that is run when you execute the commands without a version suffix, e.g. 'pytest', run:

sudo port select --set pytest pytest38

I cnverted this to a draft to check what is the problem

[codecov-commenter]

Codecov Report

Attention: 634 lines in your changes are missing coverage. Please review.

Comparison is base (943108b) 85.02% compared to head (afb930a) 84.12%. Report is 52 commits behind head on master.

:exclamation: Current head afb930a differs from pull request most recent head cc94d4f. Consider uploading reports for the commit cc94d4f to get more accurate results

Files	Patch %	Lines
src/isdb/EMMIVox.cpp	5.54%	596 Missing :warning:
src/isdb/SAXS.cpp	81.52%	34 Missing :warning:
src/core/PlumedMain.cpp	87.50%	2 Missing :warning:
src/pytorch/PytorchModel.cpp	95.65%	1 Missing :warning:
src/tools/DLLoader.cpp	80.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #989 +/- ## ========================================== - Coverage 85.02% 84.12% -0.91% ========================================== Files 601 602 +1 Lines 55309 56092 +783 ========================================== + Hits 47028 47185 +157 - Misses 8281 8907 +626 ```

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[Iximiel]

I did some experimentation (see here) and I found that there may be linking problems with blas and numpy for python 3.8 and 3.7 in the macports installation, removing them the CI should pass

python 3.7 reached EOL this year and python 3.8 will reach EOL around October 2024

[GiovanniBussi]

@Iximiel should this be backported to maintained versions of PLUMED perhaps?

[Iximiel]

Philosophicallly not, but in practice yes, for the sake of the CI working Tomorrow I'm setting up a rebase for the 2.8 that shall then be merged into the 2.9, hopefully no conflict will arise