fix(next/image): bump sharp to 0.34.3 (#81556)

This fixes a handful of issues including:

- lovell/sharp#4393
- lovell/sharp#4382
- lovell/sharp#4398
- lovell/sharp#4374
- lovell/sharp#4417

See full list of changes
lovell/sharp@v0.34.1...v0.34.3

Author: styfle

packages/next/package.json

@@ -129,7 +129,7 @@
     }
   },
   "optionalDependencies": {
-    "sharp": "^0.34.1"
+    "sharp": "^0.34.3"
   },
   "devDependencies": {
     "@ampproject/toolbox-optimizer": "2.8.3",