Fix python requirements to actually work

Didn't do deep research here, just fitted it against the current Docker
image release.

requirements.txt

@@ -1,9 +1,10 @@
-aiohttp~=3.6
+aiohttp~=3.8,<3.9
-quart~=0.17,<0.18
+quart~=0.18,<0.19
-flask-wtf~=1.0
+flask-wtf~=1.1,<1.2
 hsluv~=5.0
-flask-babel~=1.0
+flask-babel~=2.0,<3
-email-validator~=1.1
+email-validator~=1.3
 environ-config~=20.0
-wtforms~=3.0
+wtforms~=3.0,<4
 typing-extensions
+werkzeug~=2.2,<3

snikket_web/templates/login.html

@@ -30,7 +30,7 @@
 		<div class="f-bbox">
 			{%- call form_button("login", form.action_signin, class="primary") -%}{% endcall -%}
 		</div>
-	</from>
+	</form>
 	<script type="text/javascript">
 var domainCheck = function() {
 	var form = document.getElementById("login-form");