fix: packages: pyrobird: ~batch with when clause

Author: wdconinc

spack-environment/packages.yaml

@@ -328,7 +328,9 @@ packages:
     require:
     - '@0.1.23:'
     - +xrootd
-    - ~batch  # until 0.2.6, +batch requires py-pyppeteer which requires py-urllib3@1
+    - spec: ~batch
+      when: '@:0.2.6'
+      message: "through at least 0.2.6, +batch requires py-pyppeteer which requires py-urllib3@1"
   pythia8:
     require:
     - '@8.315'