Bump Sorbet version and introduce AbstractParam

[st0012]

Currently, the Param class plays 2 roles:

1. Being a class that represents normal params (used in projects like Tapioca)
2. Being the abstract class for other param types

However, after sorbet/sorbet#6273 Sorbet stops prohibiting instantiating abstract classes, which means these 2 roles can't co-exist on the same calss anymore.

I think that leaves us with 2 options:

1. Create an AbstractParam class (I'm open for a better name) as all param classes' (including Param's) superclass
2. Or create a new class to present normal params and migrate Param usages to it

Since 2) will require downstream projects to adopt new a new param class, it's functionally a breaking change.
And although 1) will also require changes, but it'll be on signatures only, which IMO can be argued as NOT a breaking change?

WDYT?

Required changes on Tapioca

diff --git a/lib/tapioca/helpers/rbi_helper.rb b/lib/tapioca/helpers/rbi_helper.rb
index 4796de77..f0fc1d7d 100644
--- a/lib/tapioca/helpers/rbi_helper.rb
+++ b/lib/tapioca/helpers/rbi_helper.rb
@@ -73,7 +73,7 @@ module Tapioca
       create_typed_param(RBI::BlockParam.new(name), type)
     end
 
-    sig { params(param: RBI::Param, type: String).returns(RBI::TypedParam) }
+    sig { params(param: RBI::AbstractParam, type: String).returns(RBI::TypedParam) }
     def create_typed_param(param, type)
       RBI::TypedParam.new(param: param, type: sanitize_signature_types(type))
     end
diff --git a/lib/tapioca/rbi_ext/model.rb b/lib/tapioca/rbi_ext/model.rb
index a85bb1d6..6aedc3c2 100644
--- a/lib/tapioca/rbi_ext/model.rb
+++ b/lib/tapioca/rbi_ext/model.rb
@@ -124,7 +124,7 @@ module RBI
   end
 
   class TypedParam < T::Struct
-    const :param, RBI::Param
+    const :param, RBI::AbstractParam
     const :type, String
   end
 end

[Morriar]

I don't think the change should be done here. Param is already abstract so the fault is on whatever is trying to instantiate it.

From what I understand the problem is mostly because of this line in Tapioca: https://github.com/Shopify/tapioca/blob/main/lib/tapioca/helpers/rbi_helper.rb#L43 ? Should it be using ReqParam instead?

[st0012]

@Morriar Yeah I think that makes more sense. I've opened Shopify/tapioca#1467 for it.

[st0012]

Close in favour of #161