update CHANGELOG.md for v1.19.0 #796

Job	Run time
Run JavaScript benchmark example	30s
Run JavaScript benchmark example	30s
Run Go benchmark example	36s
Run Go benchmark example	36s
Run Pytest benchmark example	28s
Run Pytest benchmark example	28s
Run Rust benchmark example	45s
Run Rust benchmark example	30s
Run Catch2 C++ Benchmark Framework example	47s
Run Catch2 C++ Benchmark Framework example	47s
Run Google C++ Benchmark Framework example	1m 8s
Run Google C++ Benchmark Framework example	1m 8s
Run Julia benchmark example	59s
Run Julia benchmark example	59s
Run Benchmark.Net .Net Benchmark Framework example	1m 18s
Run Benchmark.Net .Net Benchmark Framework example	1m 18s
Run JMH Java Benchmark Framework example	1m 16s
Run JMH Java Benchmark Framework example	1m 16s
Run alert check with actions/cache	39s
Run alert check with actions/cache	39s
Run linting and formatting check	30s
Run linting and formatting check	30s
Run unit tests	28s
Run unit tests	28s
	18m 33s

Provide feedback