TST: sparse.linalg: Loosen tolerance for the lobpcg test 'test_tolera…

…nce_float32' (#16755)

This test has been failing occasionally in CI, with errors slightly greater than
the requested tolerances.

(cherry picked from commit f71e7fa)

scipy/sparse/linalg/_eigen/lobpcg/tests/test_lobpcg.py

@@ -351,8 +351,8 @@ def test_tolerance_float32():
     A = A.astype(np.float32)
     X = rnd.standard_normal((n, m))
     X = X.astype(np.float32)
-    eigvals, _ = lobpcg(A, X, tol=1e-5, maxiter=50, verbosityLevel=0)
-    assert_allclose(eigvals, -np.arange(1, 1 + m), atol=1.5e-5)
+    eigvals, _ = lobpcg(A, X, tol=1.25e-5, maxiter=50, verbosityLevel=0)
+    assert_allclose(eigvals, -np.arange(1, 1 + m), atol=2e-5, rtol=1e-5)
 
 
 def test_random_initial_float32():