Downgrade artifact actions from v4 to v3 for Gitea compatibility

actions/upload-artifact@v4 and actions/download-artifact@v4 are not
supported on Gitea (GHES). Downgraded to v3.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -204,7 +204,7 @@ jobs:
           echo Repository updated at %REPO_PATH%
 
       - name: Upload Installers
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: windows-installers
           path: |
@@ -405,7 +405,7 @@ jobs:
           ls -la XPlor-*
 
       - name: Upload Installers
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: macos-installers
           path: |
@@ -416,7 +416,7 @@ jobs:
           retention-days: 90
 
       - name: Upload Repository
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: macos-repository
           path: repository/
@@ -609,7 +609,7 @@ jobs:
           ls -la XPlor-*
 
       - name: Upload Installers
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: linux-installers
           path: |
@@ -618,7 +618,7 @@ jobs:
           retention-days: 90
 
       - name: Upload Repository
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: linux-repository
           path: repository/
@@ -648,18 +648,18 @@ jobs:
           echo CHANNEL=!CHANNEL!>> %GITHUB_ENV%
 
       - name: Download all installers
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           path: artifacts
 
       - name: Download macOS repository
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: macos-repository
           path: repo-macos
 
       - name: Download Linux repository
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: linux-repository
           path: repo-linux