Weaviate 1.15 release

Weaviate 1.15 has been released with new features, performance improvements, distance metrics, and modules. Key updates include cloud-native backups for selected classes or the whole database, reduced memory usage by up to 30%, better control over garbage collector through GOMEMLIMIT, faster imports for ordered data, more efficient filtered aggregations, two new distance metrics (Hamming and Manhattan), and two new Weaviate modules (Summarization and HuggingFace).