zink: always use NEAREST for zs blits

LINEAR is illegal, and swapping filtering at this point still
seems to be conformant given questionable GL spec requirements for
LINEAR zs filtering

cc: mesa-stable

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21203>
(cherry picked from commit 067545eb9a)

.pick_status.json

@@ -247,7 +247,7 @@
         "description": "zink: always use NEAREST for zs blits",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null
     },

src/gallium/drivers/zink/zink_blit.c

@@ -252,7 +252,8 @@ blit_native(struct zink_context *ctx, const struct pipe_blit_info *info, bool *n
    VKCTX(CmdBlitImage)(cmdbuf, src->obj->image, src->layout,
                   dst->obj->image, dst->layout,
                   1, &region,
-                  zink_filter(info->filter));
+                  /* VUID-vkCmdBlitImage-srcImage-00232: zs formats must use NEAREST filtering */
+                  util_format_is_depth_or_stencil(info->src.format) ? VK_FILTER_NEAREST : zink_filter(info->filter));
 
    return true;
 }