🔧(keycloak) Fix https required issue in dev mode

On some environments keycloak returns a 'HTTPS required' message on login.
The same issue was fixed in drive by changing the 'sslRequired' value
from 'external' to 'none'.
Also upgrade keycloak up to 26.3.2

Signed-off-by: Fabre Florian <ffabre@hybird.org>

docker/auth/realm.json

@@ -26,7 +26,7 @@
   "oauth2DeviceCodeLifespan": 600,
   "oauth2DevicePollingInterval": 5,
   "enabled": true,
-  "sslRequired": "external",
+  "sslRequired": "none",
   "registrationAllowed": true,
   "registrationEmailAsUsername": false,
   "rememberMe": true,
@@ -2270,7 +2270,7 @@
     "cibaInterval": "5",
     "realmReusableOtpCode": "false"
   },
-  "keycloakVersion": "20.0.1",
+  "keycloakVersion": "26.3.2",
   "userManagedAccessAllowed": false,
   "clientProfiles": {
     "profiles": []