Update CI testing matrix in UnitTest.yml

Put julia-version on top so that it matches the outer matrix, and so the reported job name is in the same format for all of them

Signed-off-by: abhro <5664668+abhro@users.noreply.github.com>

Author: abhro

.github/workflows/UnitTest.yml

@@ -29,8 +29,8 @@ jobs:
         julia-arch: [x64]
         # only test one 32-bit job
         include:
-          - os: ubuntu-latest
-            julia-version: '1'
+          - julia-version: '1'
+            os: ubuntu-latest
             julia-arch: x86
 
     steps: