[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>

vendor/github.com/ncruces/go-sqlite3/vfs/lock.go

@@ -41,7 +41,7 @@ func (f *vfsFile) Lock(lock LockLevel) error {
 	}
 
 	// Do not allow any kind of write-lock on a read-only database.
-	if f.readOnly && lock >= LOCK_RESERVED {
+	if lock >= LOCK_RESERVED && f.flags&OPEN_READONLY != 0 {
 		return _IOERR_LOCK
 	}