all: update golang/x/ext and fix slice sorting fallout (#27909)

The Go authors updated golang/x/ext to change the function signature of the slices sort method. 
It's an entire shitshow now because x/ext is not tagged, so everyone's codebase just 
picked a new version that some other dep depends on, causing our code to fail building.

This PR updates the dep on our code too and does all the refactorings to follow upstream...

core/state/snapshot/difflayer.go

@@ -525,7 +525,7 @@ func (dl *diffLayer) AccountList() []common.Hash {
 			dl.accountList = append(dl.accountList, hash)
 		}
 	}
-	slices.SortFunc(dl.accountList, common.Hash.Less)
+	slices.SortFunc(dl.accountList, common.Hash.Cmp)
 	dl.memory += uint64(len(dl.accountList) * common.HashLength)
 	return dl.accountList
 }
@@ -563,7 +563,7 @@ func (dl *diffLayer) StorageList(accountHash common.Hash) ([]common.Hash, bool)
 	for k := range storageMap {
 		storageList = append(storageList, k)
 	}
-	slices.SortFunc(storageList, common.Hash.Less)
+	slices.SortFunc(storageList, common.Hash.Cmp)
 	dl.storageList[accountHash] = storageList
 	dl.memory += uint64(len(dl.storageList)*common.HashLength + common.HashLength)
 	return storageList, destructed

core/state/snapshot/iterator_fast.go

@@ -33,19 +33,25 @@ type weightedIterator struct {
 	priority int
 }
 
-func (it *weightedIterator) Less(other *weightedIterator) bool {
+func (it *weightedIterator) Cmp(other *weightedIterator) int {
 	// Order the iterators primarily by the account hashes
 	hashI := it.it.Hash()
 	hashJ := other.it.Hash()
 
 	switch bytes.Compare(hashI[:], hashJ[:]) {
 	case -1:
-		return true
+		return -1
 	case 1:
-		return false
+		return 1
 	}
 	// Same account/storage-slot in multiple layers, split by priority
-	return it.priority < other.priority
+	if it.priority < other.priority {
+		return -1
+	}
+	if it.priority > other.priority {
+		return 1
+	}
+	return 0
 }
 
 // fastIterator is a more optimized multi-layer iterator which maintains a
@@ -155,9 +161,7 @@ func (fi *fastIterator) init() {
 		}
 	}
 	// Re-sort the entire list
-	slices.SortFunc(fi.iterators, func(a, b *weightedIterator) bool {
-		return a.Less(b)
-	})
+	slices.SortFunc(fi.iterators, func(a, b *weightedIterator) int { return a.Cmp(b) })
 	fi.initiated = false
 }