vagrant: use 3.10.7 for binary building

Vagrantfile

@@ -161,8 +161,8 @@ def install_pythons(boxname)
   return <<-EOF
     . ~/.bash_profile
     pyenv install 3.11.0rc2  # tests
-    pyenv install 3.10.2  # tests
-    pyenv install 3.9.14  # tests, binary build
+    pyenv install 3.10.7  # tests, binary build
+    pyenv install 3.9.1   # tests
     pyenv rehash
   EOF
 end
@@ -179,9 +179,9 @@ def build_pyenv_venv(boxname)
   return <<-EOF
     . ~/.bash_profile
     cd /vagrant/borg
-    # use the latest 3.9 release
-    pyenv global 3.9.14
-    pyenv virtualenv 3.9.14 borg-env
+    # use the latest 3.10 release
+    pyenv global 3.10.7
+    pyenv virtualenv 3.10.7 borg-env
     ln -s ~/.pyenv/versions/borg-env .
   EOF
 end
@@ -228,8 +228,8 @@ def run_tests(boxname, skip_env)
     . ../borg-env/bin/activate
     if which pyenv 2> /dev/null; then
       # for testing, use the earliest point releases of the supported python versions:
-      pyenv global 3.9.14 3.10.2 3.11.0rc2
-      pyenv local 3.9.14 3.10.2 3.11.0rc2
+      pyenv global 3.9.1 3.10.7 3.11.0rc2
+      pyenv local 3.9.1 3.10.7 3.11.0rc2
     fi
     # otherwise: just use the system python
     # some OSes can only run specific test envs, e.g. because they miss FUSE support: