Use conda-standalone 25.5.1,post1

Author: ericpre

.github/workflows/release.yml

@@ -27,7 +27,7 @@ env:
   # https://github.com/usnistgov/etspy/issues/24
   TEST_DEPS: '"pytest<9" pytest-qt pytest-xdist pytest-rerunfailures pytest-mpl filelock tomli'
   CONSTRUCTOR_VERSION: '3.14.3'
-  CONDA_STANDALONE: '25.11.0'
+  CONDA_STANDALONE: '25.5.1.post1'
   CHANNEL: 'main'
   ROSETTASCIIO_CACHE_NUMBER: 0 # Increase this value to reset cache