Update all dependencies to use tree-sitter v0.20 - #812

Related discussions: #674 #789

After investigating in the test cases, found following:

1. ExpressionStatement was declared before every Statement, leading to almost double lloc.
2. The previous version of the tree-sitter used to give false positives, which led to a higher number of operators and operands. This in turn, was also affecting the metrics related to halstead. An example of this is in the file library/proc_macro/src/lib.rs#L994, you can see that in the comment there is a dash. In the previous version, this dash was being counted as an operator. Perhaps it's time to update rca-output repo once this PR manages to produce proper results.
3. It also seems that the cyclomatic complexity for rust code is incorrect. The cyclomatic compute function for RustCode utilizes two questionable node types. For and QMARK. Say there's a line as follows:

impl<T: ?Sized> UnwindSafe for Mutex<T> {}

Do we want to count the cyclomatic complexity of the above code as 2?

Investigating further problems with Cognitive, NOM, and MI. cc @marco-c @marco-ballario

After checking through the rest of the metrics, I'm 99% certain that the previous metrics were giving a lot of false positives, and that's why most of them have an error margin of ~1-2%. This PR otherwise seems ready to me for merging.

I was curious if there was any movement on this pull request? It looks like the main tree-sitter-java grammar was just updated to 0.20.0.

@tjbell

Yeah, the grammar has been updated but not on crates.io which is still at 0.19. We are trying to come up with a solution here if you are interested in the conversation