fix(protonvpn): authenticated servers data updating (#2878)

- `-proton-username` flag for cli update
- `-proton-password` flag for cli update
- `UPDATER_PROTONVPN_USERNAME` option for periodic updates
- `UPDATER_PROTONVPN_PASSWORD` option for periodic updates

.golangci.yml

@@ -56,6 +56,9 @@ linters:
           - revive
         path: internal\/provider\/(common|utils)\/.+\.go
         text: "var-naming: avoid (bad|meaningless) package names"
+      - linters:
+          - lll
+        source: "^// https://.+$"
       - linters:
           - err113
           - mnd