Fix missing sphinx testing dependencies (#1751)

* fix missing sphinx testing dependencies

* do the specifier correctly

* fix quoting

* fix again

* try another way

* try quoting again

* try without whitespace

tools/github_actions_install.sh

@@ -7,12 +7,12 @@ export PYTHONUTF8=1
 if [[ "$SPHINX_VERSION" == "" ]]; then
     SPHINX_INSTALL=""
 elif [[ "$SPHINX_VERSION" == "dev" ]]; then
-    SPHINX_INSTALL="git+https://github.com/sphinx-doc/sphinx"
+    SPHINX_INSTALL="sphinx[test]@https://codeload.github.com/sphinx-doc/sphinx/zip/refs/heads/master"
 elif [[ "$SPHINX_VERSION" == "old" ]]; then
-    SPHINX_INSTALL="sphinx==6.1.0"
+    SPHINX_INSTALL="sphinx[test]==6.1.0"
 else  # not used currently but easy enough
-    SPHINX_INSTALL="sphinx==$SPHINX_VERSION"
+    SPHINX_INSTALL="sphinx[test]==$SPHINX_VERSION"
 fi
 set -x  # print commands
 python -m pip install --upgrade pip wheel setuptools
-python -m pip install -e .["$1"] ${SPHINX_INSTALL} $2 $DEP_EXTRA
+python -m pip install -e .["$1"] ${SPHINX_INSTALL} $2