build: Update rustc to nightly-2024-07-21 (#9319)

Author: kdy1

.changeset/small-lobsters-happen.md

@@ -0,0 +1,30 @@
+---
+binding_macros: patch
+dbg-swc: patch
+swc: patch
+swc_bundler: patch
+swc_common: patch
+swc_core: patch
+swc_css_codegen: patch
+swc_css_compat: patch
+swc_css_minifier: patch
+swc_ecma_ast: patch
+swc_ecma_codegen: patch
+swc_ecma_codegen_macros: patch
+swc_ecma_lints: patch
+swc_ecma_minifier: patch
+swc_ecma_transforms_base: patch
+swc_ecma_transforms_module: patch
+swc_ecma_transforms_testing: patch
+swc_ecma_transforms_typescript: patch
+swc_ecma_usage_analyzer: patch
+swc_fast_graph: patch
+swc_html_codegen: patch
+swc_html_minifier: patch
+swc_html_parser: patch
+swc_macros_common: patch
+swc_visit: patch
+testing: patch
+---
+
+build: Update `rustc` to `nightly-2024-07-21`