Update banner to 1.0.0-rc.5 (#748)

Author: phillipleblanc

website/docusaurus.config.ts

@@ -92,7 +92,7 @@ const config: Config = {
     // image: 'img/docusaurus-social-card.jpg',
     announcementBar: {
       content:
-        '<a href="https://github.com/spiceai/spiceai/releases/tag/v1.0.0-rc.4">Spice.ai OSS v1.0.0-rc.4</a> is now available! 🚀',
+        '<a href="https://github.com/spiceai/spiceai/releases/tag/v1.0.0-rc.5">Spice.ai OSS v1.0.0-rc.5</a> is now available! 🚀',
       backgroundColor: 'var(--announcement-bar-bg)',
       textColor: 'var(--announcement-bar-text)',
       isCloseable: true,