Replace vars with consts in async exercise patches

patches/patches/088_async5.patch

@@ -4,8 +4,8 @@
  pub fn main() void {
      var myframe = async getPageTitle("http://example.com");
  
--    var value = ???
-+    var value = await myframe;
+-    const value = ???
++    const value = await myframe;
  
      print("{s}\n", .{value});
  }

patches/patches/089_async6.patch

@@ -4,10 +4,10 @@
      var com_frame = async getPageTitle("http://example.com");
      var org_frame = async getPageTitle("http://example.org");
  
--    var com_title = com_frame;
--    var org_title = org_frame;
-+    var com_title = await com_frame;
-+    var org_title = await org_frame;
+-    const com_title = com_frame;
+-    const org_title = org_frame;
++    const com_title = await com_frame;
++    const org_title = await org_frame;
  
      print(".com: {s}, .org: {s}.\n", .{ com_title, org_title });
  }

patches/patches/090_async7.patch

@@ -4,8 +4,8 @@
      // The main() function can not be async. But we know
      // getBeef() will not suspend with this particular
      // invocation. Please make this okay:
--    var my_beef = getBeef(0);
-+    var my_beef = nosuspend getBeef(0);
+-    const my_beef = getBeef(0);
++    const my_beef = nosuspend getBeef(0);
  
      print("beef? {X}!\n", .{my_beef});
  }