Update welcome messages from 2024 to 2025

Fix #214

Author: NMertsch

src/europython_discord/registration/cog.py

@@ -16,10 +16,10 @@
 _logger = logging.getLogger(__name__)
 
 REGISTRATION_BUTTON_LABEL = "Register here :point-left:"
-WELCOME_MESSAGE_TITLE = "## Welcome to EuroPython 2024 on Discord! :tada::snake:"
+WELCOME_MESSAGE_TITLE = "## Welcome to EuroPython 2025 on Discord! :tada::snake:"
 
 
-class RegistrationForm(discord.ui.Modal, title="EuroPython 2024 Registration"):
+class RegistrationForm(discord.ui.Modal, title="EuroPython 2025 Registration"):
     def __init__(
         self,
         config: RegistrationConfig,
@@ -194,7 +194,7 @@ async def on_ready(self) -> None:
             :two: Fill in your Order ID and the name on your ticket. You can find them
             * Printed on your ticket
             * Printed on your badge
-            * In the email "[EuroPython 2024] Your order: XXXXX" from support@pretix.eu
+            * In the email "[EuroPython 2025] Your order: XXXXX" from support@pretix.eu
 
             :three: Click "Submit".
 
@@ -204,7 +204,7 @@ async def on_ready(self) -> None:
             * In the {reg_help_channel.mention} channel
             * By speaking to a volunteer in a yellow t-shirt
 
-            Enjoy our EuroPython 2024 Community Server! :snake::computer::tada:
+            Enjoy our EuroPython 2025 Community Server! :snake::computer::tada:
             """ % REGISTRATION_BUTTON_LABEL
         )