Refine memory management and system info handling

- Continued transition to arena allocator by removing unnecessary deinitialization.
- Improved memory management practices in the main Zig file.

.github/release-nest-v3

@@ -1 +1 @@
-1
+2

pikafetch/debian/changelog

@@ -1,4 +1,4 @@
-pikafetch (0.2.0-101pika2) pika; urgency=medium
+pikafetch (0.2.0-101pika3) pika; urgency=medium
 
   * Move to zig nightly, remove all use of libc, switch to using arena allocator
 

pikafetch/src/main.zig

@@ -5,7 +5,6 @@ const terminal = @import("display/terminal.zig");
 
 pub fn main() !void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
-    defer arena.deinit();
     const allocator = arena.allocator();
 
     var info = try system_info.SystemInfo.init(allocator);