Documentation: update installation for using python 3.11.9

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@roscar @schmidtp

docs/development/installation.md

@@ -11,7 +11,7 @@ to do this.
 
 ## Installation using python virtual environment - recommended
 
-`pycalibration` uses Python 3.8. Currently, the default
+`pycalibration` uses Python 3.11. 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.
 
@@ -29,9 +29,9 @@ to manage different versions of python. This can be activated with
 A quick setup would be:
 
 1.  `source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate`
-2.  `git clone --branch 3.14.4 ssh://git@git.xfel.eu:10022/detectors/pycalibration.git && cd pycalibration` -
+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
@@ -43,9 +43,8 @@ Copy/paste script:
 ```bash
 source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate
 git clone ssh://git@git.xfel.eu:10022/detectors/pycalibration.git
-git checkout 3.14.4  # Use this version for compatibility with Python 3.8.18
 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