Fix Python version in workflows (#2296)

Summary:
When 3.10 is not enclosed in quotes, the workflow fails after trying to install python 3.1. See: https://github.com/pytorch/botorch/actions/runs/8660750040/job/23749260305?fbclid=IwAR3w-htfo2N4O3FIvn59LTL-ha_kdzn06bEL5xVJYxY1iMty7XOrzydSlzQ

Pull Request resolved: #2296

Test Plan: Nightly cron: https://github.com/pytorch/botorch/actions/runs/8665243516

Reviewed By: esantorella

Differential Revision: D56068106

Pulled By: saitcakmak

fbshipit-source-id: 5db206be9a36d5f3d3c25479c6c5cd3f8511e3a1

Author: saitcakmak

.github/workflows/nightly.yml

@@ -50,7 +50,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.10
+        python-version: "3.10"
     - name: Install dependencies
       env:
         ALLOW_LATEST_GPYTORCH_LINOP: true

.github/workflows/reusable_website.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.10
+        python-version: "3.10"
     - name: Fetch all history for all tags and branches
       run: git fetch --prune --unshallow
     - if: ${{ !inputs.publish_versioned_website }}