Update GraalPy in CI to 25.0

Author: skirpichev

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-24.04]
-        python-version: [3.9, '3.10', pypy3.11, graalpy-24.2,
+        python-version: [3.9, '3.10', pypy3.11, graalpy-25.0,
                          3.11, 3.12, 3.13, 3.13t, 3.14, 3.14t]
     runs-on: ${{ matrix.os }}
     env:

tests/test_mpz.py

@@ -687,6 +687,8 @@ def test_power_errors():
         pow(mpz(10**1000), 1j)
     with pytest.raises(TypeError):
         pow(object(), mpz(321))
+    if platform.python_implementation() == "GraalVM":
+        return  # issue oracle/graalpython#551
     with pytest.raises(MemoryError):
         pow(mpz(123), 111111111111111111)