Suppress git hint about default branch name in test

This silences the unnecessary git hint visible when running `go test`:

    === RUN   TestSnapshotVersion
    hint: Using 'master' as the name for the initial branch. This default branch name
    hint: is subject to change. To configure the initial branch name to use in all
    hint: of your new repositories, which will suppress this warning, call:
    hint:
    hint: 	git config --global init.defaultBranch <name>
    hint:
    hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
    hint: 'development'. The just-created branch can be renamed via this command:
    hint:
    hint: 	git branch -m <name>
    hint:
    hint: Disable this message with "git config set advice.defaultBranchName false"

Author: ottok

version_test.go

@@ -32,7 +32,8 @@ func TestSnapshotVersion(t *testing.T) {
 		t.Fatalf("Could not write temp file %q: %v", tempfile, err)
 	}
 
-	gitCmdOrFatal(t, tempdir, "init")
+	// Suppress git hint about default branch name by setting init.defaultBranch
+	gitCmdOrFatal(t, tempdir, "init", "--initial-branch=master")
 	gitCmdOrFatal(t, tempdir, "config", "user.email", "unittest@example.com")
 	gitCmdOrFatal(t, tempdir, "config", "user.name", "Unit Test")
 	gitCmdOrFatal(t, tempdir, "add", "test")