ci: bump rust toolchain to 1.88.0

Author: hiimjako

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           override: true
           components: clippy, rustfmt
-          toolchain: 1.87.0
+          toolchain: 1.88.0
           target: x86_64-unknown-linux-gnu
           rustflags: ""
       - name: Environment