feat: Bump MSRV to 1.81.0 (contentauth#781)

Required due to version updates in some dependent crates.

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest, macos-latest, ubuntu-latest]
-        rust_version: [stable, 1.76.0]
+        rust_version: [stable, 1.81.0]
 
     steps:
       - name: Checkout repository
@@ -214,7 +214,7 @@ jobs:
       fail-fast: false
       matrix:
         target: [aarch64-unknown-linux-gnu]
-        rust_version: [stable, 1.76.0]
+        rust_version: [stable, 1.81.0]
 
     steps:
       - name: Checkout repository
@@ -368,7 +368,7 @@ jobs:
       - name: Install nightly Rust toolchain
         # Nightly is used here because the docs.rs build
         # uses nightly and we use doc_cfg features that are
-        # not in stable Rust as of this writing (Rust 1.76).
+        # not in stable Rust as of this writing (Rust 1.81).
         uses: dtolnay/rust-toolchain@nightly
 
       - name: Run cargo docs

README.md

@@ -36,6 +36,10 @@ This is a beta release (version 0.x.x) of the project. The minor version number
 
 NOTE: The current release includes a new API that replaces old methods of reading and writing C2PA data, which are deprecated.  See the [release notes](docs/release-notes.md) for more information. 
 
+### Rust language requirement (MSRV)
+
+The `c2pa` crate requires Rust version 1.81.0 or newer. When a newer version of Rust becomes required, a new minor (0.x.0) version of this crate will be released.
+
 ### Contributions and feedback
 
 We welcome contributions to this project.  For information on contributing, providing feedback, and about ongoing work, see [Contributing](https://github.com/contentauth/c2pa-rs/blob/main/CONTRIBUTING.md).  For additional information on nightly builds and testing, see [Contributing to the project](docs/project-contributions.md).

cawg_identity/Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 keywords = ["identity"]
 categories = ["api-bindings"]
 edition = "2021"
-rust-version = "1.76.0"
+rust-version = "1.81.0"
 exclude = ["tests/fixtures"]
 
 [package.metadata.docs.rs]

docs/usage.md

@@ -11,7 +11,7 @@ The C2PA Rust library has been tested on the following operating systems:
 
 ## Requirements
 
-The C2PA Rust library requires **Rust version 1.76.0** or newer.
+The C2PA Rust library requires **Rust version 1.81.0** or newer.
 
 To use the library, add this to your `Cargo.toml`:
 

export_schema/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.36.1"
 authors = ["Dave Kozma <[email protected]>"]
 license = "MIT OR Apache-2.0"
 edition = "2018"
-rust-version = "1.76.0"
+rust-version = "1.81.0"
 
 [dependencies]
 anyhow = "1.0.40"

internal/crypto/Cargo.toml

@@ -18,7 +18,7 @@ readme = "README.md"
 keywords = ["metadata"]
 categories = ["api-bindings"]
 edition = "2021"
-rust-version = "1.76.0"
+rust-version = "1.81.0"
 exclude = ["tests/fixtures"]
 
 [package.metadata.docs.rs]

internal/status-tracker/Cargo.toml

@@ -13,7 +13,7 @@ homepage = "https://contentauthenticity.org"
 repository = "https://github.com/contentauth/c2pa-rs"
 readme = "README.md"
 edition = "2021"
-rust-version = "1.76.0"
+rust-version = "1.81.0"
 exclude = ["tests/fixtures"]
 
 [package.metadata.docs.rs]

make_test_images/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.36.1"
 authors = ["Gavin Peacock <[email protected]>"]
 license = "MIT OR Apache-2.0"
 edition = "2021"
-rust-version = "1.76.0"
+rust-version = "1.81.0"
 
 [dependencies]
 anyhow = "1.0.40"

sdk/Cargo.toml

@@ -18,7 +18,7 @@ readme = "../README.md"
 keywords = ["xmp", "metadata"]
 categories = ["api-bindings"]
 edition = "2021"
-rust-version = "1.76.0"
+rust-version = "1.81.0"
 exclude = ["tests/fixtures"]
 
 [package.metadata.docs.rs]