build(deps): update dependency simple-git to v2 (#6783)

lib/datasource/git-refs/index.spec.ts

lib/datasource/git-refs/index.ts

lib/datasource/git-submodules/index.spec.ts

lib/datasource/git-submodules/index.ts

lib/datasource/git-tags/index.spec.ts

lib/manager/bundler/artifacts.spec.ts

lib/manager/cocoapods/artifacts.spec.ts

lib/manager/git-submodules/extract.spec.ts

lib/manager/git-submodules/extract.ts

lib/manager/git-submodules/update.spec.ts

lib/manager/git-submodules/update.ts

lib/manager/gradle-wrapper/artifacts-real.spec.ts

lib/manager/gradle-wrapper/artifacts.spec.ts

lib/manager/gradle-wrapper/artifacts.ts

lib/platform/azure/azure-helper.ts

lib/util/git/index.spec.ts

lib/util/git/index.ts

package.json

yarn.lock