Add .patch for 108_labeled_switch

patches/patches/108_labeled_switch.patch

@@ -0,0 +1,11 @@
+--- a/exercises/108_labeled_switch.zig
++++ b/exercises/108_labeled_switch.zig
+@@ -26,7 +26,7 @@ pub fn main() void {
+     // try to fix it!
+     pr: switch (@as(PullRequestState, PullRequestState.Draft)) {
+         PullRequestState.Draft => continue :pr PullRequestState.InReview,
+-        PullRequestState.InReview => continue :pr PullRequestState.Rejected,
++        PullRequestState.InReview => continue :pr PullRequestState.Approved,
+         PullRequestState.Approved => continue :pr PullRequestState.Merged,
+         PullRequestState.Rejected => std.debug.print("The pull request has been rejected", .{}),
+         PullRequestState.Merged => std.debug.print("The pull request has been merged", .{}),