go: update to version 1.18 (#33)

Go only supports -2 major versions. Currently we're on Go 1.20, so the
last supported version is 1.18.

Let's update the library from Go 1.17 to Go 1.18

Merge pull request #14 from g4s8/13-preload

Preload method with benchmarks

Merge pull request #10 from g4s8/9-race-workflow

Added Github action to reproduce races and fixed

Merge pull request #7 from mx-psi/mx-psi/depth-one

Make a shallow clone when cloning a git repository

Merge pull request #2 from ninnymuggins97/feature/add-scan-file-content

Feature/add scan file content

ci: release

Merge pull request #69 from lafriks/feat/spdx_3_8

Update SPDX to version 3.8

Merge pull request #67 from johanbrandhorst/update-blackfriday-reference

Correct the blackfriday import reference

Merge pull request #66 from vmarkovtsev/master

Update to go-git 4.13.1

Merge pull request #62 from vmarkovtsev/master

v3