fix: indent PowerShell here-string body in push.yml to fix YAML parse error

PR #343 added a Generate release body step with a PowerShell here-string
but the body content (between @ and @) was not indented, causing YAML
to interpret ** as alias references. This broke the push workflow with
a parse error.

Fix: indent the here-string body and closing @ to 8 spaces to stay
within the YAML | block scalar.

Author: ModerRAS

.github/workflows/push.yml

@@ -687,15 +687,15 @@ jobs:
       run: |
         $buildDate = Get-Date -Format "yyyy-MM-dd"
         $body = @"
-## Release $env:BUILD_VERSION
-
-**Build Date**: $buildDate
-
-**Full Release Package**: TelegramSearchBot-win-x64-full-$env:BUILD_VERSION.zip
-**Updater**: moder_update_updater.exe
-
-### Changes
-"@
+        ## Release $env:BUILD_VERSION
+        
+        **Build Date**: $buildDate
+        
+        **Full Release Package**: TelegramSearchBot-win-x64-full-$env:BUILD_VERSION.zip
+        **Updater**: moder_update_updater.exe
+        
+        ### Changes
+        "@
         Set-Content -Path "$env:RUNNER_TEMP\release-body.md" -Value $body -Encoding utf8
         Write-Host "Generated release body for version $env:BUILD_VERSION"
     - name: Publish full package to GitHub Release