Merge pull request #1446 from input-output-hk/increase_mainnet_backends

chore: increase backend providers for mainnet

Author: bernokl

nix/cardano-services/deployments/default.nix

@@ -443,7 +443,7 @@ in
           providers = {
             backend = {
               enabled = true;
-              replicas = 2;
+              replicas = 4;
               env.NODE_ENV = "production";
             };
             stake-pool-provider = {
@@ -503,7 +503,7 @@ in
           providers = {
             backend = {
               enabled = true;
-              replicas = 2;
+              replicas = 4;
               env.NODE_ENV = "production";
             };
             stake-pool-provider = {