chore: update ubuntu runner from 20.04 to latest #973

Job	Run time
Run JavaScript benchmark example	31s
Run Benchmark.Net .Net Benchmark Framework example	1m 19s
Run linting and formatting check	16s
Run Go benchmark example	40s
Run Julia benchmark example	1m 7s
Run unit tests	25s
Run JMH Java Benchmark Framework example	1m 9s
Run Pytest benchmark example	29s
Run Catch2 C++ Benchmark Framework example (v2.x)	58s
Run Rust benchmark example	25s
Run Criterion.rs benchmark example	1m 59s
Run alert check with actions/cache	33s
Run Google C++ Benchmark Framework example	1m 21s
Run Catch2 C++ Benchmark Framework example (v3.x)	1m 13s
	12m 25s

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