Remove outdated Django version warning (#1345)

Since:
- the version check was pretty broken (only matches against
  that exact requirements file version syntax, plus doesn't
  check unpinned but still outdated version etc)
- it only warned for Django 1.x, when there are lots of other
  EOL Django versions since then
- it feels inconsistent for us to warn about one framework being
   EOL when there are lots of other packages and frameworks out
   there that should also be kept up to date too -- that's best handled
   by services like Dependabot security alerts etc

If at such time in the future our Django collectstatic feature requires a
specific version of Django, any version checking/warning should occur
as part of that feature.

GUS-W-11593026.

Author: edmorley

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Remove outdated Django version warning ([#1345](https://github.com/heroku/heroku-buildpack-python/pull/1345)).
 
 ## v214 (2022-08-02)
 

bin/steps/pip-install

@@ -29,14 +29,6 @@ if [ ! "$SKIP_PIP_INSTALL" ]; then
         mcount "failure.none-version"
     fi
 
-    # TODO: Either remove this or fix since it's pretty broken at the moment - for example it
-    # doesn't match against a requirements specifier of 'Django >=1.11,<2' amongst others.
-    if grep -qi '^django==1.*' requirements.txt; then
-        puts-warn "Your Django version is nearing the end of its community support."
-        puts-warn "Upgrade to continue to receive security updates and for the best experience with Django."
-        puts-warn "For more information, check out https://www.djangoproject.com/download/#supported-versions"
-    fi
-
     if [ ! -f "$BUILD_DIR/.heroku/python/bin/pip" ]; then
         exit 1
     fi

spec/fixtures/requirements_django_1.11/requirements.txt

@@ -3,33 +3,6 @@
 require_relative '../spec_helper'
 
 RSpec.describe 'Django support' do
-  describe 'Unsupported version warnings' do
-    context 'when requirements.txt contains Django==1.11' do
-      let(:app) { Hatchet::Runner.new('spec/fixtures/requirements_django_1.11') }
-
-      it 'warns about Django end of support' do
-        app.deploy do |app|
-          expect(clean_output(app.output)).to include(<<~OUTPUT)
-            remote: -----> Installing requirements with pip
-            remote:  !     Your Django version is nearing the end of its community support.
-            remote:  !     Upgrade to continue to receive security updates and for the best experience with Django.
-            remote:  !     For more information, check out https://www.djangoproject.com/download/#supported-versions
-          OUTPUT
-        end
-      end
-    end
-
-    context 'when requirements.txt contains Django==2.1' do
-      let(:app) { Hatchet::Runner.new('spec/fixtures/requirements_django_2.1') }
-
-      it 'does not warn about Django end of support' do
-        app.deploy do |app|
-          expect(app.output).not_to include('https://www.djangoproject.com/download/#supported-versions')
-        end
-      end
-    end
-  end
-
   describe 'collectstatic' do
     context 'when building a Django project' do
       let(:app) { Hatchet::Runner.new('python-getting-started') }