gh-111178: fix UBSan failures in `Modules/_collectionsmodule.c` (#129773)

Fix some UBSan failures for `dequeobject`, `dequeiterobject`, `defdictobject` and `tuplegetterobject`.

We also perform some cleanup by suppressing unused return values and renaming the
unused argument in `METH_NOARGS` methods to `dummy` for semantic purposes.