fix: add missing max-retries input to csharp-publish

Add missing max-retries input declaration that was being used by the
step-security/retry step at line 171 but not defined in the inputs
section.

Changes:
- Add max-retries input with default value of '3'
- Add description for dependency restoration retry attempts
- Regenerate README.md with updated inputs documentation

This fixes undefined input reference in the Restore Dependencies step.

csharp-publish/README.md

@@ -8,11 +8,12 @@ Publishes a C# project to GitHub Packages.
 
 ### Inputs
 
-| name             | description                                        | required | default     |
-|------------------|----------------------------------------------------|----------|-------------|
-| `dotnet-version` | <p>Version of .NET SDK to use.</p>                 | `false`  | `""`        |
-| `namespace`      | <p>GitHub namespace for the package.</p>           | `true`   | `ivuorinen` |
-| `token`          | <p>GitHub token with package write permissions</p> | `false`  | `""`        |
+| name             | description                                                        | required | default     |
+|------------------|--------------------------------------------------------------------|----------|-------------|
+| `dotnet-version` | <p>Version of .NET SDK to use.</p>                                 | `false`  | `""`        |
+| `namespace`      | <p>GitHub namespace for the package.</p>                           | `true`   | `ivuorinen` |
+| `token`          | <p>GitHub token with package write permissions</p>                 | `false`  | `""`        |
+| `max-retries`    | <p>Maximum number of retry attempts for dependency restoration</p> | `false`  | `3`         |
 
 ### Outputs
 
@@ -48,4 +49,10 @@ This action is a `composite` action.
     #
     # Required: false
     # Default: ""
+
+    max-retries:
+    # Maximum number of retry attempts for dependency restoration
+    #
+    # Required: false
+    # Default: 3
 ```