Documentation: update installation for using python 3.11.9

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@roscar @schmidtp

docs/development/installation.md

@@ -11,27 +11,21 @@ to do this.
 
 ## Installation using python virtual environment - recommended
 
-`pycalibration` uses Python 3.8. Currently, the default
-python installation on Maxwell is still Python 3.6.8, so Python 3.8
-needs to be loaded from a different location.
+`pycalibration` uses the same version of Python as Karabo, which in June 2021
+updated to use Python 3.11. Currently the default python installation on Maxwell
+is still Python 3.9, so Python 3.11 needs to be loaded from a different
+location.
 
-One option is to use the Maxwell Spack installation, running `module
-load maxwell` will activate the test Spack instance from
-DESY, then you can use `module load
-python-3.8.6-gcc-10.2.0-622qtxd` to Python 3.8. Note that
-this Spack instance is currently a trial phase and may not be stable.
-
-Another option is to use `pyenv`, we provide a pyenv
-installation at `/gpfs/exfel/sw/calsoft/.pyenv` which we use
-to manage different versions of python. This can be activated with
-`source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate`
+Therefore `pyenv` is used, we provide a pyenv installation at
+`/gpfs/exfel/sw/calsoft/.pyenv` which we use to manage different versions of
+python. This can be activated with ``source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate``
 
 A quick setup would be:
 
 1.  `source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate`
 2.  `git clone ssh://git@git.xfel.eu:10022/detectors/pycalibration.git && cd pycalibration` -
     clone the offline calibration package from EuXFEL GitLab
-3.  `pyenv shell 3.8.18` - load required version of python
+3.  `pyenv shell 3.11.9` - load required version of python
 4.  `python3 -m venv .venv` - create the virtual environment
 5.  `source .venv/bin/activate` - activate the virtual environment
 6.  `python3 -m pip install --upgrade pip` - upgrade version of pip
@@ -44,7 +38,7 @@ Copy/paste script:
 source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate
 git clone ssh://git@git.xfel.eu:10022/detectors/pycalibration.git
 cd pycalibration
-pyenv shell 3.8.18
+pyenv shell 3.11.9
 python3 -m venv .venv
 source .venv/bin/activate
 python3 -m pip install --upgrade pip