Fix parsing of gradle dependency tree

[pascal-hofmann]

In one of my projects I have a gradle dependency tree that looks like this:

-api (n)
No dependencies

-runtime (n)
\--- org.jetbrains.kotlin:kotlin-stdlib:1.3.30 (n)
[…]

This breaks the gradle analyzer. It bails out with the error message

FATAL Could not analyze: bad depth: 1 -api (n) []string{"-api (n)", "-", "api (n)"}

This PR improves the regex used to match gradle dependencies based on the possible output generated by gradle (see https://github.com/gradle/gradle/blob/e975872ae2cf1d521b73f1107cae772ca09c63cd/subprojects/core/src/main/java/org/gradle/internal/graph/GraphRenderer.java)

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #500 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #500   +/-   ##
======================================
  Coverage    52.4%   52.4%           
======================================
  Files         103     103           
  Lines        5761    5761           
======================================
  Hits         3019    3019           
  Misses       2461    2461           
  Partials      281     281

Impacted Files	Coverage Δ
buildtools/gradle/gradle.go	59.19% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 235c833...d5ce1f3. Read the comment docs.

[pascal-hofmann]

cla-assistant.io is down right now. Will sign the CLA once it is back up…

Edit: This is done (signed) now.

[dchenk]

Thanks for the proposed fix. One comment about the regex.

[pascal-hofmann]

Hey, do I still need to do something to get this merged?

[dchenk]

Apologies for the delayed response. I was going to investigate why the CI tests failed. I'd like to get this merged soon.

[dchenk]

Thanks a lot!