Update Rust crate cocoa to 0.26 (#17036)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [cocoa](https://togithub.com/servo/core-foundation-rs) | dependencies
| minor | `0.25` -> `0.26` |
| [cocoa](https://togithub.com/servo/core-foundation-rs) |
workspace.dependencies | minor | `0.25` -> `0.26` |

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Release Notes:

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Mikayla <mikayla@zed.dev>

crates/gpui/src/platform/mac/text_system.rs

@@ -4,7 +4,7 @@ use crate::{
     RenderGlyphParams, Result, ShapedGlyph, ShapedRun, SharedString, Size, SUBPIXEL_VARIANTS,
 };
 use anyhow::anyhow;
-use cocoa::appkit::{CGFloat, CGPoint};
+use cocoa::appkit::CGFloat;
 use collections::HashMap;
 use core_foundation::{
     attributed_string::CFMutableAttributedString,
@@ -16,6 +16,7 @@ use core_graphics::{
     base::{kCGImageAlphaPremultipliedLast, CGGlyph},
     color_space::CGColorSpace,
     context::CGContext,
+    display::CGPoint,
 };
 use core_text::{
     font::CTFont,