Pin xeus-sql to >=0.3.1 with kernel_info_reply fix (#51)

Version 0.3.1 includes the fix for missing `status` field in
kernel_info_reply that was reported upstream.

_Submitted on @rgbkrk's behalf by his agent Quill_

Author: rgbkrk

.github/workflows/conformance.yml

@@ -61,7 +61,8 @@ jobs:
             install: micromamba install -y xeus-cling -c conda-forge
             kernel-name: xcpp17
           - name: xeus-sql
-            install: micromamba install -y xeus-sql -c conda-forge
+            # Pin to 0.3.1 which includes fix for missing status in kernel_info_reply
+            install: micromamba install -y "xeus-sql>=0.3.1" -c conda-forge
             kernel-name: xsql
           - name: gonb
             install: |