Fix a false positive for Lint/NumberConversion

This PR fixes the following false positive and incorrect auto-correct
for `Lint/NumberConversion` when `:to_f` is one of multiple method arguments.

```console
% cat example.rb
delegate :to_f, to: :description, allow_nil: true

% bundle exec rubocop --only Lint/NumberConversion -A example.rb
(snip)

Inspecting 1 file
W

Offenses:

example.rb:1:1: W: [Corrected] Lint/NumberConversion: Replace unsafe
number conversion with number class parsing, instead of using :to_f, use
stricter { |i| Float(i) }.
delegate :to_f, to: :description, allow_nil: true
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

1 file inspected, 1 offense detected, 1 offense corrected

% cat example.rb
delegate { |i| Float(i) }, to: :description, allow_nil: true

% ruby -c example.rb
example.rb:1: syntax error, unexpected ',', expecting end-of-input
delegate { |i| Float(i) }, to: :description, allow_nil:...
```

changelog/fix_a_false_positive_for_lint_number_conversion.md

@@ -0,0 +1 @@
+* [#9757](https://github.com/rubocop/rubocop/pull/9757): Fix a false positive for `Lint/NumberConversion` when `:to_f` is one of multiple method arguments. ([@koic][])

lib/rubocop/cop/lint/number_conversion.rb

@@ -97,7 +97,7 @@ def handle_conversion_method(node)
 
         def handle_as_symbol(node)
           to_method_symbol(node) do |receiver, sym_node, to_method|
-            next if receiver.nil?
+            next if receiver.nil? || !node.arguments.one?
 
             message = format(
               MSG,

spec/rubocop/cop/lint/number_conversion_spec.rb

@@ -121,6 +121,12 @@
         to_i
       RUBY
     end
+
+    it 'when `:to_f` is one of multiple method arguments' do
+      expect_no_offenses(<<~RUBY)
+        delegate :to_f, to: :description, allow_nil: true
+      RUBY
+    end
   end
 
   context 'to_method in symbol form' do