[ci] turn sccache stats error into warning

This unbreaks ci

Pull Request resolved: https://github.com/pytorch/pytorch/pull/79443

Approved by: https://github.com/janeyx99
diff --git a/.github/workflows/_linux-build.yml b/.github/workflows/_linux-build.yml
index 4ca1802..9a9cae0 100644
--- a/.github/workflows/_linux-build.yml
+++ b/.github/workflows/_linux-build.yml
@@ -147,7 +147,7 @@
           s3-prefix: |
             ${{ github.repository }}/${{ github.run_id }}/${{ github.run_attempt }}/artifact
           retention-days: 365
-          if-no-files-found: error
+          if-no-files-found: warn
           path: sccache-stats-*.json
 
       - name: Teardown Linux
diff --git a/.github/workflows/_win-build.yml b/.github/workflows/_win-build.yml
index f6405b0..b33af2e 100644
--- a/.github/workflows/_win-build.yml
+++ b/.github/workflows/_win-build.yml
@@ -97,7 +97,7 @@
           s3-prefix: |
             ${{ github.repository }}/${{ github.run_id }}/${{ github.run_attempt }}/artifact
           retention-days: 14
-          if-no-files-found: error
+          if-no-files-found: warn
           path: sccache-stats-*.json
 
       - name: Teardown Windows