Fix incorrect arguments for Time.zone.local

These usages were intended for Time.zone.parse and have been changed
accordingly.

In Ruby 3.1.x an error occurs when a String is passed to
Time.zone.local:

irb(main):001:0> Time.zone.local("2017-07-27 16:01:01").utc
/Users/kevin.dew/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/activesupport-7.0.2.3/lib/active_support/values/time_zone.rb:355:in `utc': invalid value for Integer(): "2017-07-27 16:01:01" (ArgumentError)

It's worth noting that this didn't actually behave correctly before. The
string argument just seemed to be converted into "2017":

irb(main):001:0> Time.zone.local("2017-07-27 16:01:01")
=> Sun, 01 Jan 2017 00:00:00.000000000 UTC +00:00

spec/queries/get_expanded_links_spec.rb

@@ -24,7 +24,7 @@
 
   context "when generate is false" do
     context "and there are expanded links stored" do
-      let(:updated_at) { Time.zone.local("2017-07-27 16:01:01").utc }
+      let(:updated_at) { Time.zone.parse("2017-07-27 16:01:01").utc }
       let(:expanded_links) do
         {
           link_type: { content_id: SecureRandom.uuid },

spec/requests/expanded_links_endpoint_spec.rb

@@ -1,6 +1,6 @@
 RSpec.describe "GET /v2/expanded-links/:id", type: :request do
   let(:content_id) { SecureRandom.uuid }
-  let(:updated_at) { Time.zone.local("2017-07-27 16:44:00") }
+  let(:updated_at) { Time.zone.parse("2017-07-27 16:44:00") }
 
   context "when requested without a locale" do
     let(:expanded_links) do