chore: update Go version to 1.24.4 (#18408)

Updates all Go version references in the codebase to use Go 1.24.4.

## Changes
- Update `go.mod` to use Go 1.24.4
- Update `dogfood/coder/Dockerfile` GO_VERSION to 1.24.4  
- Update `.github/actions/setup-go/action.yaml` default version to
1.24.4
- Update `examples/parameters-dynamic-options/variables.yml` to use
golang:1.24

## Testing
- ✅ All Go version references are consistent (verified with
`scripts/check_go_versions.sh`)
- ✅ Build tested successfully with Go 1.24.4
- ✅ Binary runs correctly

Co-authored-by: blink-so[bot] <211532188+blink-so[bot]@users.noreply.github.com>
Co-authored-by: sreya <4856196+sreya@users.noreply.github.com>

.github/actions/setup-go/action.yaml

@@ -4,7 +4,7 @@ description: |
 inputs:
   version:
     description: "The Go version to use."
-    default: "1.24.2"
+    default: "1.24.4"
   use-preinstalled-go:
     description: "Whether to use preinstalled Go."
     default: "false"