fix usestdlibvars linter

Signed-off-by: Tim Ramlot <42113979+inteon@users.noreply.github.com>

.golangci.yaml

@@ -13,7 +13,6 @@ issues:
         - forbidigo
         - interfacebloat
         - predeclared
-        - usestdlibvars
         - noctx
         - nilnil
         - nakedret

internal/vault/vault.go

@@ -569,6 +569,7 @@ func (v *Vault) IsVaultInitializedAndUnsealed() error {
 	// 473 = if performance standby
 	// 501 = if not initialized
 	// 503 = if sealed
+	// nolint: usestdlibvars // We use the numeric error codes here that we got from the Vault docs.
 	if err != nil {
 		switch {
 		case healthResp == nil: