chore(lint): upgrade golangci-lint to v1.47.2

- Fix Slowloris attacks on HTTP servers
- Force set default of 5 minutes for pprof read timeout
- Change `ShutdownTimeout` to time.Duration since it cannot be set to 0

internal/configuration/settings/settings_test.go

@@ -67,6 +67,8 @@ func Test_Settings_String(t *testing.T) {
 ├── Health settings:
 |   ├── Server listening address: 127.0.0.1:9999
 |   ├── Target address: cloudflare.com:443
+|   ├── Read header timeout: 100ms
+|   ├── Read timeout: 500ms
 |   └── VPN wait durations:
 |       ├── Initial duration: 6s
 |       └── Additional duration: 5s