Update git-ci.yml

try to add CI for R2021a and R2023a

Author: rjackey

.github/workflows/git-ci.yml

@@ -17,7 +17,7 @@ jobs:
         platform: [ubuntu-latest, windows-latest]
 
         # List of MATLAB releases over which to run the tests.
-        matlab-version: [R2023b, R2024a, R2024b, latest]
+        matlab-version: [R2021a, R2023a, R2023b, R2024a, R2024b, latest]
 
         # UITest with gestures only from R2023b and later.
 
@@ -29,6 +29,12 @@ jobs:
         # Exclude unsupported Linux jobs prior to R2024b.
         exclude:
 
+          - platform: ubuntu-latest
+            matlab-version: R2021a
+            
+          - platform: ubuntu-latest
+            matlab-version: R2023a
+            
           - platform: ubuntu-latest
             matlab-version: R2023b