Fix all errcheck linter issues

Co-authored-by: Junie <junie@jetbrains.com>

cmd/metacrypt/unseal.go

@@ -82,7 +82,7 @@ func unsealViaGRPC(addr, caCertPath, password string) error {
 	if err != nil {
 		return fmt.Errorf("grpc dial: %w", err)
 	}
-	defer conn.Close()
+	defer func() { _ = conn.Close() }()
 
 	client := metacryptv1.NewSystemServiceClient(conn)
 	resp, err := client.Unseal(context.Background(), &metacryptv1.UnsealRequest{Password: password})
@@ -113,7 +113,7 @@ func unsealViaREST(addr, caCertPath, password string) error {
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	var result struct {
 		State string `json:"state"`