Add tests for invalid strings containing d

Fixes pythongh-114014.

`\d` can easily be mistyped as simply `d`. Add tests for it.
```
(?P<decimal>d*|\d+(_\d+)*)
            ^^
```

Lib/test/test_fractions.py

@@ -261,6 +261,30 @@ def testFromString(self):
  self.assertRaisesMessage(
  ValueError, "Invalid literal for Fraction: '1.1e+1__1'",
  F, "1.1e+1__1")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: '123.dd'",
+ F, "123.dd")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: '123.5_dd'",
+ F, "123.5_dd")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: 'dd.5'",
+ F, "dd.5")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: '7_dd'",
+ F, "7_dd")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: '1/dd'",
+ F, "1/dd")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: '1/123_dd'",
+ F, "1/123_dd")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: '789edd'",
+ F, "789edd")
+ self.assertRaisesMessage(
+ ValueError, "Invalid literal for Fraction: '789e2_dd'",
+ F, "789e2_dd")
  # Test catastrophic backtracking.
  val = "9"*50 + "_"
  self.assertRaisesMessage(