Remove unused parse_embedding_response from Bedrock embeddings

Bedrock overrides embed at the provider level (it needs per-request
SigV4 signing and cannot batch, so it issues one InvokeModel request
per text and parses the responses inline). That means the base
parse_embedding_response hook is never called, leaving it as dead code.
Drop it; embedding_url and render_embedding_payload remain and are used.

Author: cgmoore120

lib/ruby_llm/providers/bedrock/embeddings.rb

@@ -17,14 +17,6 @@ def render_embedding_payload(text, model:, dimensions:) # rubocop:disable Lint/U
           payload[:normalize] = true
           payload
         end
-
-        def parse_embedding_response(response, model:, text:) # rubocop:disable Lint/UnusedMethodArgument
-          data = response.body
-          vectors = data['embedding']
-          input_tokens = data['inputTextTokenCount'] || 0
-
-          Embedding.new(vectors:, model:, input_tokens:)
-        end
       end
     end
   end