chore(security): update traefik to 2.10.7

Addresses two CVE fixes from 2.10.6

.env.sample

@@ -56,6 +56,7 @@ COMPOSE_FILE="compose.yml"
 # abra app secrets insert {myapp.example.coop} ssl_key v1 "$(cat /path/to/privkey.pem)"
 #WILDCARDS_ENABLED=1
 #SECRET_WILDCARD_CERT_VERSION=v1
+#SECRET_WILDCARD_KEY_VERSION=v1
 #COMPOSE_FILE="$COMPOSE_FILE:compose.wildcard.yml"
 
 #####################################################################

compose.wildcard.yml

@@ -12,5 +12,5 @@ secrets:
     name: ${STACK_NAME}_ssl_cert_${SECRET_WILDCARD_CERT_VERSION}
     external: true
   ssl_key:
-    name: ${STACK_NAME}_ssl_key_${SECRET_WILDCARD_CERT_VERSION}
-    external: true
+    name: ${STACK_NAME}_ssl_key_${SECRET_WILDCARD_KEY_VERSION}
+    external: true

compose.yml

@@ -3,7 +3,7 @@ version: "3.8"
 
 services:
   app:
-    image: "traefik:v2.10.5"
+    image: "traefik:v2.10.7"
     # Note(decentral1se): *please do not* add any additional ports here.
     # Doing so could break new installs with port conflicts. Please use
     # the usual `compose.$app.yml` approach for any additional ports