Addresses the following error that was encountered when attempting to execute the GitHub Actions that correspond with the edited workflows files:

https://github.com/DMPRoadmap/roadmap/actions/runs/9513143079/job/26222602325
3s

```
Run bundle exec rails db:create RAILS_ENV=test
To use retry middleware with Faraday v2.0+, install `faraday-retry` gem
To use multipart middleware with Faraday v2.0+, install `faraday-multipart` gem; note: this is used by the ManageGHES client for uploading licenses
Copying Bootstrap glyphicons to the public directory ...
Copying TinyMCE skins to the public directory ...
/home/runner/work/roadmap/roadmap/config/initializers/recaptcha.rb:8:in `block in <main>': undefined method `[]' for nil:NilClass (NoMethodError)
	from /home/runner/work/roadmap/roadmap/vendor/bundle/ruby/3.0.0/gems/recaptcha-5.17.0/lib/recaptcha.rb:37:in `configure'
	from /home/runner/work/roadmap/roadmap/config/initializers/recaptcha.rb:7:in `<main>'
```

Prior to this commit, the Rails credentials were not being updated during this setup process.

Omitting the arguments results in lambda implicitly using self, which appears to be the desired behaviour here. It also resolves the Rubocop offences.

`template.visibilty` now returns a string rather than an integer.

The Rails 7 upgrade actually fixes a couple of bugs within `app/views/org_admin/templates/_form.html.erb` and `app/views/org_admin/templates/_show.html.erb`. Prior to this upgrade, template.visibility would return an integer. Now that it is returning a string, the `f.object.visibility == 'organisationally_visible'` and `template.visibility == 'organisationally_visible'` checks within the aforementioned files are behaving as desired.

Prior to this commit, the default checked/unchecked values were used (i.e. "1" would be returned when checked, and "0" would be returned when unchecked). However, the box is meant to be checked when selecting 'organisationally_visible' ('for internal %{org_name} use only'), which makes the default checked/unchecked values opposite to the mapping of our enums (i.e. `{"organisationally_visible"=>0, "publicly_visible"=>1}`).

Rails 7 appears to apply stricter parsing rules. If the Content-Type is not JSON, then the body will not be parsed as JSON.

Fix PostgreSQL GitHub Action and Tests For Rails 7 Upgrade

Added `coder:` and `type:` keywords in various places to address deprecation warnings.

Example warning (before adding `type: ` keyword in `app/models/user.rb`:
````
Please pass the class as a keyword argument:

  serialize :prefs, type: Hash
 (called from <class:User> at /path/to/app/models/user.rb:73)
DEPRECATION WARNING: Passing the class as positional argument is deprecated and will be removed in Rails 7.2.
```

This change addresses the following deprecation warnings:
```
DEPRECATION WARNING: Setting action_dispatch.show_exceptions to false is deprecated. Set to :none instead. (called from rescue in call at /usr/share/rvm/gems/ruby-3.0.5@upstream/gems/actionpack-7.1.3.4/lib/action_dispatch/middleware/debug_exceptions.rb:43)
DEPRECATION WARNING: Setting action_dispatch.show_exceptions to false is deprecated. Set to :none instead. (called from rescue in call at /usr/share/rvm/gems/ruby-3.0.5@upstream/gems/actionpack-7.1.3.4/lib/action_dispatch/middleware/show_exceptions.rb:36)
```

Address Deprecation Warnings