Add CI on Julia 1.9 and fix Ubuntu builds for unsupported versions (#313)

* Add CI on Julia 1.9 and fix Ubuntu builds for unsupported versions

* Remove ubuntu-latest duplicate

* New attempt at CI.yml action syntax

Author: gdalle

.github/workflows/CI.yml

@@ -16,15 +16,23 @@ jobs:
       matrix:
         version:
           - '1.0'
-          - '1.5'
           - '1.6'
-          - '1.7'
-          - '1.8'
+          - '1.9'
           - 'nightly'
-        os:
-          - ubuntu-latest
         arch:
           - x64
+        os:
+          - ubuntu-latest
+        include:
+          - version: '1.5'
+            arch: x64
+            os: ubuntu-20.04
+          - version: '1.7'
+            arch: x64
+            os: ubuntu-20.04
+          - version: '1.8'
+            arch: x64
+            os: ubuntu-22.04
     steps:
       - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1