downgrade upload-artifact action to v3

GitHub Enterpise Server is not compatible with upload-artifact@v4+.
https://github.com/actions/upload-artifact/tree/v4

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #24029)

(cherry picked from commit 0892716)

.github/workflows/fips-checksums.yml

@@ -69,7 +69,7 @@ jobs:
       - name: save PR number
         run: echo ${{ github.event.number }} > ./artifact/pr_num
       - name: save artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: fips_checksum
           path: artifact/

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
         fuzz-seconds: 600
         dry-run: false
     - name: Upload Crash
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v3
       if: failure()
       with:
         name: artifacts