[ruff] Ignore std cmath.inf (RUF069) (#23120)

## Summary

See: #20585

## Test Plan

`cargo nextest run ruf069`

Author: chirizxc

crates/ruff_linter/resources/test/fixtures/ruff/RUF069.py

@@ -77,3 +77,11 @@ def _numpy_torch():
     assert numpy_inf == 1e300 * 1e300  # ok
 
     assert torch_inf == 1e300 * 1e300  # ok
+
+
+def _cmath():
+    import cmath
+
+    assert cmath.inf == 1e300 * 1e300  # ok
+
+    assert cmath.infj == complex(0, 1e300 * 1e300)  # ok

crates/ruff_linter/src/rules/ruff/rules/float_equality_comparison.rs

@@ -218,13 +218,14 @@ fn should_skip_comparison(expr: &Expr, semantic: &SemanticModel) -> bool {
             false
         }
 
-        // Skip `inf` when imported from `math`, `numpy` or `torch`
+        // Skip `inf` when imported from `math`, `cmath`, `numpy` or `torch`
+        // and `infj` from `cmath`
         _ => semantic
             .resolve_qualified_name(expr)
             .is_some_and(|qualified_name| {
                 matches!(
                     qualified_name.segments(),
-                    ["math" | "numpy" | "torch", "inf"]
+                    ["math" | "numpy" | "torch", "inf"] | ["cmath", "inf" | "infj"]
                 )
             }),
     }