Set Django to 4.0.1, add DB migrations

Now that we're somewhat Django4 compatible it's time to advertise our
newfound skill! Not all functionality has been tested, but it is
starting again.

contest/migrations/0021_alter_qso_otherno_alter_qso_ownno_alter_user_dncall_and_more.py

@@ -0,0 +1,65 @@
+# Generated by Django 4.0.1 on 2022-01-22 16:18
+
+import django.contrib.auth.validators
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contest', '0020_auto_20190122_2348'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='qso',
+            name='otherNo',
+            field=models.IntegerField(blank=True, null=True, validators=[django.core.validators.MinValueValidator(1), django.core.validators.MaxValueValidator(1000000)], verbose_name='No-R'),
+        ),
+        migrations.AlterField(
+            model_name='qso',
+            name='ownNo',
+            field=models.IntegerField(validators=[django.core.validators.MinValueValidator(1), django.core.validators.MaxValueValidator(1000000)], verbose_name='No'),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='dncall',
+            field=models.CharField(blank=True, default='', help_text='If you have a DN call that you will offer to SWLs please enter it here', max_length=16, verbose_name='DN-Call'),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='extra2m70cm',
+            field=models.BooleanField(default=False, help_text='Will you bring an additional 2m/70cm TRX to lend to other participants?', verbose_name='Additional 2m/70cm TRX'),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='first_name',
+            field=models.CharField(blank=True, max_length=150, verbose_name='first name'),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='last_name',
+            field=models.CharField(blank=True, max_length=150, verbose_name='last name'),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='qrv2m',
+            field=models.BooleanField(default=False, help_text='Will you be QRV on 2m during the contest?', verbose_name='QRV on 2m'),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='qrv70cm',
+            field=models.BooleanField(default=False, help_text='Will you be QRV on 70cm during the contest?', verbose_name='QRV on 70cm'),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='regTime',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='username',
+            field=models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.', max_length=150, unique=True, validators=[django.contrib.auth.validators.UnicodeUsernameValidator()], verbose_name='username'),
+        ),
+    ]

requirements.txt

@@ -1,4 +1,4 @@
-Django<1.12
+Django==4.0.1
 django-crispy-forms
 django-rest-framework
 django-filter