gh-36709: get rid of coerce_try

    
remove the deprecated `_coerce_try` method in `parent_old`

### 📝 Checklist

- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
    
URL: #36709
Reported by: Frédéric Chapoton
Reviewer(s): Matthias Köppe

src/doc/en/thematic_tutorials/coercion_and_categories.rst

@@ -114,7 +114,6 @@ This base class provides a lot more methods than a general parent::
      '_coerce_',
      '_coerce_c',
      '_coerce_impl',
-     '_coerce_try',
      '_default_category',
      '_gens',
      '_ideal_class_',

src/sage/structure/parent_old.pyx

@@ -216,31 +216,6 @@ cdef class Parent(parent.Parent):
         check_old_coerce(self)
         return self._coerce_c_impl(x)
 
-    def _coerce_try(self, x, v):
-        """
-        Given a list v of rings, try to coerce x canonically into each
-        one in turn.  Return the __call__ coercion of the result into
-        self of the first canonical coercion that succeeds.  Raise a
-        :class:`TypeError` if none of them succeed.
-
-        INPUT:
-
-        - x -- Python object
-        - v -- parent object or list (iterator) of parent objects
-        """
-        deprecation(33464, "usage of _coerce_try is deprecated")
-        check_old_coerce(self)
-        if not isinstance(v, list):
-            v = [v]
-
-        for R in v:
-            try:
-                y = R._coerce_(x)
-                return self(y)
-            except (TypeError, AttributeError) as msg:
-                pass
-        raise TypeError("no canonical coercion of element into self")
-
     cdef __has_coerce_map_from_c(self, S) noexcept:
         check_old_coerce(self)
         if self == S: