chore: Update MSRV to 1.80

Signed-off-by: Dmitry Dygalo <[email protected]>

Author: Stranger6667

.github/workflows/build.yml

@@ -175,7 +175,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.75"
+          toolchain: "1.80"
 
       - uses: Swatinem/rust-cache@v2
         with:

README.md

@@ -57,7 +57,7 @@ To include it in your project, add the following line to the dependencies sectio
 css-inline = "0.17"
 ```
 
-The Minimum Supported Rust Version is 1.75.
+The Minimum Supported Rust Version is 1.80.
 
 ## Usage
 

bindings/c/CHANGELOG.md

@@ -6,6 +6,10 @@
 
 - `minify_css` option [#12](https://github.com/Stranger6667/css-inline/issues/12)
 
+### Changed
+
+- Bump MSRV to `1.80`.
+
 ## [0.17.0] - 2025-07-26
 
 ### Added