Add OTP 28 to test matrix

Add OTP 28 to the matrix for the build and test CI workflow.

Signed-off-by: Winford <winford@object.stream>

Author: UncleGrumpy

.github/workflows/build-and-test.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: "ubuntu-22.04"
     strategy:
       matrix:
-        otp: ["25", "26", "27"]
+        otp: ["25", "26", "27", "28"]
 
     steps:
     # Setup