Remove retired runners from CI

Both Ubuntu 20.04 and Windows 2019 runners have been retired and are no
longer available.

Author: ikalnytskyi

.github/workflows/ci.yml

@@ -18,14 +18,13 @@ jobs:
     strategy:
       matrix:
         os:
-          - ubuntu-20.04
           - ubuntu-22.04
           - ubuntu-24.04
           - macos-13
           - macos-14
           - macos-15
-          - windows-2019
           - windows-2022
+          - windows-2025
     steps:
       - uses: actions/checkout@v4
 
@@ -56,14 +55,13 @@ jobs:
     strategy:
       matrix:
         os:
-          - ubuntu-20.04
           - ubuntu-22.04
           - ubuntu-24.04
           - macos-13
           - macos-14
           - macos-15
-          - windows-2019
           - windows-2022
+          - windows-2025
         postgres-version:
           - "14"
           - "15"

tests/test_action.py

@@ -20,17 +20,6 @@ def is_windows() -> bool:
     return os.name == "nt"
 
 
-@pytest.fixture(scope="function")
-def is_windows_server_2019(is_windows: bool) -> bool:
-    """Returns True if running on Windows Server 2019."""
-
-    if not is_windows:
-        return False
-
-    windows_caption = subprocess.check_output(["wmic", "os", "get", "Caption"], text=True)
-    return "Windows Server 2019" in windows_caption
-
-
 @pytest.fixture(scope="function")
 def connection_uri() -> str:
     """Read and return connection URI from environment."""
@@ -108,27 +97,24 @@ def test_server_encoding(connection: psycopg.Connection):
     assert connection.execute("SHOW SERVER_ENCODING").fetchone()[0] == "UTF8"
 
 
-def test_locale(connection: psycopg.Connection, is_windows_server_2019: bool):
-    """Test that PostgreSQL's locale matches the one we paased to initdb."""
-
-    locale_exp = "en_US.UTF-8"
+def test_locale(connection: psycopg.Connection):
+    """Test that PostgreSQL's locale matches the one we passed to initdb."""
 
-    if is_windows_server_2019:
-        locale_exp = "en-US"
+    locale_expected = "en_US.UTF-8"
 
     record = connection \
         .execute("SELECT datcollate, datctype FROM pg_database WHERE datname = 'template0'") \
         .fetchone()
     assert record
-    assert locale.normalize(record[0]) == locale_exp
-    assert locale.normalize(record[1]) == locale_exp
+    assert locale.normalize(record[0]) == locale_expected
+    assert locale.normalize(record[1]) == locale_expected
 
     record = connection \
         .execute("SELECT datcollate, datctype FROM pg_database WHERE datname = 'template1'") \
         .fetchone()
     assert record
-    assert locale.normalize(record[0]) == locale_exp
-    assert locale.normalize(record[1]) == locale_exp
+    assert locale.normalize(record[0]) == locale_expected
+    assert locale.normalize(record[1]) == locale_expected
 
 
 def test_environment_variables(is_windows: bool):