docs(local-windows-rdp): fix invalid coder_agent.main.name in README examples

[blinkagent]

Problem

The README examples for the local-windows-rdp module reference coder_agent.main.name, but the coder_agent resource does not export a name attribute (see provider/agent.go). Users copying the example from the registry page hit:

Error: Unsupported attribute
  on main.tf line 179, in module "rdp_desktop":
  179:     agent_name = coder_agent.main.name
This object has no argument, nested block, or exported attribute named "name".

Fix

Replace coder_agent.main.name with the hardcoded string "main" in the two affected examples, matching the convention used in other registry templates (e.g. templates/docker/main.tf). The third example in the README already used a hardcoded string ("windows") correctly.

Created on behalf of @ericpaulsen

[github-actions]

Version Bump Required

One or more modules in this PR need their versions updated.

To fix this:

1. Run the version bump script locally:

   ./.github/scripts/version-bump.sh patch

2. Commit the changes:

   git add . && git commit -m "chore: bump module versions (patch)"

3. Push your changes

The CI will automatically re-run once you push the updated versions.