Wave v1.15.4

Feature updates and improvements

• Add blocking executor to async caches by @pditommaso in https://github.com/seqeralabs/wave/pull/759
• Add ExecutesOn annotation to error controller by @pditommaso in a2db2b0

Full changelog: https://github.com/seqeralabs/wave/compare/v1.15.3...v1.15.4