Adjust go.mod file by lowering go and introducing toolchain

[StefMa]

Right now we are using go 1.22.2
See

summaraizer/go.mod

Line 3 in 5aef0aa

go 1.22.2

This means that this project can only be used with at least go 1.22.2.
Since this is (right now) the latest Go version not many projects can use it.

Why doing this? We don't need it 🙃
We might not use "newer" features available in this Go version.

We can lower this version but using toolchain go1.22.2 to use the latest go version to compile the code.