fix(deps): update dependency @sentry/gatsby to v8

Author: renovate[bot]

Diff for: packages/gatsby-theme-iterative/package.json

@@ -13,7 +13,7 @@
     "@babel/plugin-transform-react-jsx": "^7.23.4",
     "@reach/portal": "^0.18.0",
     "@reach/skip-nav": "^0.18.0",
-    "@sentry/gatsby": "^7.107.0",
+    "@sentry/gatsby": "^8.0.0",
     "@svgr/webpack": "^8.0.0",
     "@types/gatsbyjs__reach-router": "^2.0.4",
     "@types/isomorphic-fetch": "^0.0.39",