Fix bind_parameter_test for mysql with unprepared statements

```
Failure:

ActiveRecord::BindParameterTest#test_bind_params_to_sql_with_unprepared_statements [test/cases/bind_parameter_test.rb:170]:
--- expected
+++ actual
@@ -1 +1 @@
-"SELECT `authors`.* FROM `authors` WHERE `authors`.`id` IN (1, 2, 3)"
+"SELECT `authors`.* FROM `authors` WHERE `authors`.`id` IN ('1', '2', '3')"

bin/test test/cases/bind_parameter_test.rb:168
```

This is because only the Mysql adapter treats numerics with `to_s` in
all cases, causing this test to fail.

Since this test was never run in CI, we didn't know about it was wrong.
I've tried changing the behavior of the abstract Mysql adapter to be
similar as PG where `Numeric#finite?` cases pass to super but there are
tests for the current behavior and am trying to avoid making any
breaking changes in order to fix the prepared statement tests for Mysql.

Author: zzak

activerecord/test/cases/bind_parameter_test.rb

@@ -238,8 +238,13 @@ def assert_bind_params_to_sql
           #
           #   SELECT `authors`.* FROM `authors` WHERE `authors`.`id` IN (1, 2, 3)
           #
-          sql = "SELECT #{table}.* FROM #{table} WHERE #{pk} IN (#{bind_params(1..3)})"
+          if current_adapter?(:Mysql2Adapter)
+            params = bind_params((1..3).map(&:to_s))
+          else
+            params = bind_params(1..3)
+          end
 
+          sql = "SELECT #{table}.* FROM #{table} WHERE #{pk} IN (#{params})"
           arel_node = Arel.sql("SELECT #{table}.* FROM #{table} WHERE #{pk} IN (?)", [1, 2, 3])
           assert_equal sql, @connection.to_sql(arel_node)
           assert_queries_match(sql) { assert_equal 3, @connection.select_all(arel_node).length }