Merge pull request #2404 from bsipocz/gha_fix_predeps

Fix predeps test job

Author: bsipocz

tox.ini

@@ -51,17 +51,9 @@ commands =
     cov:  pytest --pyargs astroquery {toxinidir}/docs --ignore={toxinidir}/docs/gallery* --cov astroquery --cov-config={toxinidir}/setup.cfg {posargs}
     cov: coverage xml -o {toxinidir}/coverage.xml
 
-[testenv:predeps]
-description = run tests with pre-releases
-pip_pre = True
-
-deps = {[testenv]deps}
-passenv = {[testenv]passenv}
-pypi_filter = {[testenv]pypi_filter}
-changedir = {[testenv]changedir}
-extras = {[testenv]extras}
-commands = {[testenv]commands}
-
+pip_pre =
+    predeps: true
+    !predeps: false
 
 [testenv:codestyle]
 changedir = {toxinidir}