Temporarily exclude linux32 from CI (#3022)

Author: IanButterworth

.github/workflows/test.yml

@@ -40,6 +40,8 @@ jobs:
         exclude:
           - os: macOS-latest
             julia-arch: x86
+          - os: ubuntu-latest # exclude because linux32 nightlies are stuck at commit 5b2a4b1e45 (2022-02-13 06:27 UTC)
+            julia-arch: x86
     steps:
       - name: Set git to use LF
         if: matrix.os == 'windows-latest'