[chore] update dependencies (#4468)

- github.com/ncruces/go-sqlite3
- codeberg.org/gruf/go-mempool
- codeberg.org/gruf/go-structr (changes related on the above) *
- codeberg.org/gruf/go-mutexes (changes related on the above) *

* this is largely just fiddling around with package internals in structr and mutexes to rely on changes in mempool, which added a new concurrency-safe pool

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4468
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

internal/queue/simple.go

@@ -31,7 +31,7 @@ import (
 // elements to reduce overall memory usage.
 type SimpleQueue[T any] struct {
 	l list.List[T]
-	p mempool.UnsafePool
+	p mempool.UnsafeSimplePool
 	w chan struct{}
 	m sync.Mutex
 }