Update staging hostname (#7347)

## Problem

```
Could not resolve host: console.stage.neon.tech
```

## Summary of changes
- replace `console.stage.neon.tech` with `console-stage.neon.build`

.github/actions/neon-branch-create/action.yml

@@ -10,7 +10,7 @@ inputs:
     required: true
   api_host:
     desctiption: 'Neon API host'
-    default: console.stage.neon.tech
+    default: console-stage.neon.build
 outputs:
   dsn:
     description: 'Created Branch DSN (for main database)'

.github/actions/neon-branch-delete/action.yml

@@ -13,7 +13,7 @@ inputs:
     required: true
   api_host:
     desctiption: 'Neon API host'
-    default: console.stage.neon.tech
+    default: console-stage.neon.build
 
 runs:
   using: "composite"

.github/actions/neon-project-create/action.yml

@@ -13,7 +13,7 @@ inputs:
     default: 15
   api_host:
     desctiption: 'Neon API host'
-    default: console.stage.neon.tech
+    default: console-stage.neon.build
   provisioner:
     desctiption: 'k8s-pod or k8s-neonvm'
     default: 'k8s-pod'

.github/actions/neon-project-delete/action.yml

@@ -10,7 +10,7 @@ inputs:
     required: true
   api_host:
     desctiption: 'Neon API host'
-    default: console.stage.neon.tech
+    default: console-stage.neon.build
 
 runs:
   using: "composite"