Chore: Remove obsolete "version" parameter from docker-compose files

docker-compose.db-dev.yml

@@ -16,8 +16,6 @@
 # SLAVE_POSTGRES_PORT=5433
 # SLAVE_POSTGRES_HOST=localhost
 
-version: '2'
-
 services:
 
     postgresql-master:

docker-compose.server-dev.yml

@@ -1,8 +1,6 @@
 # This compose file can be used in development to run both the database and app
 # within Docker.
 
-version: '3'
-
 services:
     app:
         build:

docker-compose.server.yml

@@ -15,8 +15,6 @@
 #	- This would typically be mapped to port to 443 (TLS) with a reverse proxy.
 #	- If Joplin Server does not need to be accessible over the internet, the port can be mapped to 22300.
 
-version: '3'
-
 networks:
     app-network:
     transcribe-network: