skip python 3.13t since conda doesn't support it yet (#2757)

Summary:

# context
* there are failures in torchrec binary validation {F1975312017}
* because conda can't support python 3.13t
```
$ conda create -n test python=3.13t
Collecting package metadata (current_repodata.json): done
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed

PackagesNotFoundError: The following packages are not available from current channels:

  - python=3.13t

Current channels:

  - https://repo.anaconda.com/pkgs/main/linux-64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/linux-64
  - https://repo.anaconda.com/pkgs/r/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

```

Differential Revision: D69962038

Author: TroyGarden

.github/workflows/validate-binaries.yml

@@ -1,33 +1,18 @@
 name: Validate binaries
 
 on:
-  workflow_call:
-    inputs:
-      channel:
-        description: "Channel to use (nightly, release)"
-        required: false
-        type: string
-        default: release
-      ref:
-        description: 'Reference to checkout, defaults to empty'
-        default: ""
-        required: false
-        type: string
-  workflow_dispatch:
-    inputs:
-      channel:
-        description: "Channel to use (nightly, release, test, pypi)"
-        required: true
-        type: choice
-        options:
-          - release
-          - nightly
-          - test
-      ref:
-        description: 'Reference to checkout, defaults to empty'
-        default: ""
-        required: false
-        type: string
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/validate-nightly-binaries.yml
+      - .github/workflows/validate-binaries.yml
+      - .github/scripts/validate-binaries.sh
+  pull_request:
+    paths:
+      - .github/workflows/validate-nightly-binaries.yml
+      - .github/workflows/validate-binaries.yml
+      - .github/scripts/validate-binaries.sh
 
 jobs:
   validate-binaries: