chore: bump msrv to 1.80

Author: joshka

.github/workflows/check.yml

@@ -11,4 +11,4 @@ jobs:
       checks: write
     uses: joshka/github-workflows/.github/workflows/rust-check.yml@main
     with:
-      msrv: 1.74.0
+      msrv: 1.80.0

Cargo.toml

@@ -8,7 +8,7 @@ authors = ["Joshka"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/joshka/tui-widgets"
 edition = "2021"
-rust-version = "1.74.0"
+rust-version = "1.80.0"
 categories = ["command-line-interface", "gui"]
 keywords = ["cli", "console", "ratatui", "terminal", "tui"]