Thanks for this new release!

On macOS 10.14.6 with many Homebrew packages installed,
starting from a working previous beta release,
Sage 9.4.beta6 builds and passes all but one doctests.

```
$ git pull origin develop --tags -q && git branch -v
* develop      8bae3ff7ad Updated SageMath version to 9.4.beta6
$ source .homebrew-build-env
$ ./bootstrap -q
$ ./configure -q
$ make -s V=0
$ make -s V=0 testlong
...
----------------------------------------------------------------------
sage -t --long --random-seed=0 src/sage/geometry/polyhedron/base.py  # 1 
doctest failed
----------------------------------------------------------------------
Total time for all tests: 15741.9 seconds
    cpu time: 12528.9 seconds
    cumulative wall time: 15317.8 seconds
Pytest is not installed, skip checking tests that rely on it.
make: *** [testlong] Error 1
```

Here is the test failure:

```
$ ./sage -t --long --random-seed=0 src/sage/geometry/polyhedron/base.py
Running doctests with ID 2021-07-25-13-39-10-94bfce9c.
Git branch: develop
Using 
--optional=build,dochtml,gap_packages,homebrew,libsemigroups,pip,sage,sage_spkg
Doctesting 1 file.
sage -t --long --warn-long 69.6 --random-seed=0 
src/sage/geometry/polyhedron/base.py
**********************************************************************
File "src/sage/geometry/polyhedron/base.py", line 6651, in 
sage.geometry.polyhedron.base.Polyhedron_base.face_lattice
Failed example:
    n == get_memory_usage()
Expected:
    True
Got:
    False
**********************************************************************
1 item had failures:
   1 of  42 in sage.geometry.polyhedron.base.Polyhedron_base.face_lattice
    [1758 tests, 1 failure, 100.97 s]
----------------------------------------------------------------------
sage -t --long --warn-long 69.6 --random-seed=0 
src/sage/geometry/polyhedron/base.py  # 1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 101.6 seconds
    cpu time: 54.0 seconds
    cumulative wall time: 101.0 seconds
Pytest is not installed, skip checking tests that rely on it.
```

Possibly related to Singular, if it is the same failure as in
https://trac.sagemath.org/ticket/31623

I will try rebasing #32001 on Sage 9.4.beta6 to see
if upgrading to Singular 4.2.1 solves this problem.

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