snowflake-connector-python: fix matrix collapse and cp314t curve test

The bare `include:` python list shared no key with the `version` matrix
axis, so each entry merged into every combination in order and the last
one (cp314t) silently overwrote matrix.python for every leg -- only
cp314t ever built, for every version, since the version-axis refactor
(#1937). Restore a real `python:` axis alongside it.

That surfaced the actual cp314t (and now cp312/cp313/cp314) failure:
test_auth_keypair_ecdsa_unsupported_curve generates a SECP192R1 key as
test setup, and our riscv64 cryptography wheel's OpenSSL build has no
legacy provider, so cryptography itself raises UnsupportedAlgorithm
before the connector's own curve check ever runs. Deselect it.

Author: luhenry

.github/workflows/build-snowflake-connector-python.yml

@@ -53,6 +53,11 @@ jobs:
       matrix:
         version: ${{ fromJSON(needs.setup.outputs.versions) }}
         # Per-interpreter (not abi3): the Cython extension links the version-specific ABI.
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+        # `include` entries that share no key with another axis merge into every
+        # combination in order, so without the `python` axis above the last entry
+        # here (cp314t) silently overwrote matrix.python for every version and the
+        # cp312/cp313/cp314 legs never ran.
         include:
           - python: "cp312"
             pytest_dist: "-n auto --dist loadfile"
@@ -133,7 +138,10 @@ jobs:
           # The first three -k names need a native minicore blob, which upstream
           # ships for eight platforms but not riscv64; the last five chmod a path
           # and expect the EACCES that root - which cibuildwheel runs the tests
-          # as - never gets.
+          # as - never gets. test_auth_keypair_ecdsa_unsupported_curve generates a
+          # SECP192R1 key as test setup; our riscv64 cryptography wheel's OpenSSL
+          # build has no legacy provider, so cryptography itself raises
+          # UnsupportedAlgorithm before the connector's own curve check runs.
           CIBW_TEST_COMMAND: >-
             python -c "from snowflake.connector.nanoarrow_arrow_iterator import PyArrowRowIterator" &&
             pytest -m "unit and not sso and not pandas and not lambda and not aio"
@@ -144,7 +152,8 @@ jobs:
             and not test_log_debug_config_file_parent_dir_permissions
             and not test_read_only
             and not test_config_file_inaccessible_path
-            and not test_put_error"
+            and not test_put_error
+            and not test_auth_keypair_ecdsa_unsupported_curve"
             ${{ matrix.pytest_dist }}
             --ignore {package}/test/unit/aio
             --ignore {package}/test/unit/test_ocsp.py