too old version of JDK

[l3r8yJ]

So, here we can see that eo currently uses JDK version 11. Upgrading it to version 21 might make sense, as newer JDK versions often include performance improvements and optimizations.

eo/pom.xml

Lines 384 to 385 in 201e3bb

	<source>11</source>
	<target>11</target>

I believe this upgrade could improve overall performance, at least with ability to use virtual threads in 21th, with performance improvements of G1GC/ZGC it 17th. I know that it can be expensive task, but result can worth it

@yegor256 @maxonfjvipon @volodya-lombrozo wdyt, guys?

[yegor256]

@l3r8yJ in my opinion, such performance improvements are not important at the moment, because our compiler is still very much experimental. In order to talk about high performance, we need to create a totally different 1) compiler and 2) runtime. Most probably, both of them should be written in Rust.