[CI] Disable test for Airflow-2.5 and Python-3.11 combination (#1124)

## Description
We noticed in PR
#1107 that tests are
failing with errors
```
    TIMEZONE = pendulum.tz.timezone("UTC")
E   TypeError: 'module' object is not callable
```
Found that this is happening because pendulum upgrade and CI is not
using the constraints file.
This PR disabled the test for Airflow2.5 and Python3.11 combination
because constraints does not exist this.

CI Job success:
https://github.com/astronomer/astronomer-cosmos/actions/runs/10139381920
CI Job failure:
https://github.com/astronomer/astronomer-cosmos/actions/runs/10136915016/
Airflow 2.5 constraints:
https://github.com/apache/airflow/tree/constraints-2-5


## Checklist

- [ ] I have made corresponding changes to the documentation (if
required)
- [ ] I have added tests that prove my fix is effective or that my
feature works

.github/workflows/test.yml

@@ -43,6 +43,8 @@ jobs:
         exclude:
           - python-version: "3.11"
             airflow-version: "2.4"
+          - python-version: "3.11"
+            airflow-version: "2.5"
           # Apache Airflow versions prior to 2.9.0 have not been tested with Python 3.12.
           # Official support for Python 3.12 and the corresponding constraints.txt are available only for Apache Airflow >= 2.9.0.
           # See: https://github.com/apache/airflow/tree/2.9.0?tab=readme-ov-file#requirements
@@ -100,6 +102,8 @@ jobs:
         exclude:
           - python-version: "3.11"
             airflow-version: "2.4"
+          - python-version: "3.11"
+            airflow-version: "2.5"
     services:
       postgres:
         image: postgres