fix(ci): use Python 3.10 instead of Python 3.9 on Windows

On Windows, the CI images recently removed Python 3.9 without
us being notified. This should fix the CI failures we have
been seeing as a consequence.

Author: addaleax

.evergreen/compile-artifact.sh

@@ -33,6 +33,18 @@ if uname -p | sed -e 's/s390/matches/' -e 's/ppc/matches/' | grep -q matches; th
   python --version
 fi
 
+if [ "$OS" == "Windows_NT" ]; then
+  # Windows machines only have Python 3.10 and 2.7, since Python 3.9
+  # was removed from them. Python 3.10 support may or may not be
+  # backported to Node.js 14: https://github.com/nodejs/node/pull/40296/
+  # For now, let's use Python 2.7.
+  export PATH="/cygdrive/c/Python27/Scripts:/cygdrive/c/Python27:$PATH"
+  export FORCE_PYTHON2=1
+
+  echo "Using python version:"
+  python --version
+fi
+
 export PUPPETEER_SKIP_CHROMIUM_DOWNLOAD="true"
 npm run evergreen-release compile
 dist/mongosh --version

.evergreen/setup-env.sh

@@ -1,7 +1,7 @@
 set -e
 set -x
 export BASEDIR="$PWD/.evergreen"
-export PATH="$BASEDIR/mingit/cmd:$BASEDIR/mingit/mingw64/libexec/git-core:$BASEDIR/git-2:$BASEDIR/node-v$NODE_JS_VERSION-win-x64:/opt/python/3.6/bin:/opt/chefdk/gitbin:/cygdrive/c/Python39/Scripts:/cygdrive/c/Python39:/cygdrive/c/cmake/bin:/opt/mongodbtoolchain/v3/bin:$PATH"
+export PATH="$BASEDIR/mingit/cmd:$BASEDIR/mingit/mingw64/libexec/git-core:$BASEDIR/git-2:$BASEDIR/node-v$NODE_JS_VERSION-win-x64:/opt/python/3.6/bin:/opt/chefdk/gitbin:/cygdrive/c/Python310/Scripts:/cygdrive/c/Python310:/cygdrive/c/cmake/bin:/opt/mongodbtoolchain/v3/bin:$PATH"
 export IS_MONGOSH_EVERGREEN_CI=1
 
 if [ "$OS" != "Windows_NT" ]; then