Drop support for older, major dep versions

This idea won't work. Dependency resolution selects the
latest-and-greatest for this package. But the user is free to select
an incompatible version. Sorry for the commit noise; should've tested
earlier.

Author: mciantyre

.github/workflows/rust.yaml

@@ -45,36 +45,6 @@ jobs:
     - name: Run tests
       run: cargo test --features=imxrt-ral/imxrt1062,smoltcp/socket-udp
 
-  imxrt-ral-compat:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        imxrt-ral-version: ["0.5.4", "0.6.1"]
-    steps:
-    - uses: actions/checkout@v6
-    - run: rustup toolchain install stable --no-self-update --profile minimal --target thumbv7em-none-eabihf
-    - name: Pin imxrt-ral version
-      run: cargo update -p imxrt-ral --precise ${{ matrix.imxrt-ral-version }}
-    - name: Check the package
-      run: cargo check --features=imxrt-ral/imxrt1062,smoltcp/socket-udp --target=x86_64-unknown-linux-gnu --target=thumbv7em-none-eabihf
-    - name: Run tests
-      run: cargo test --features=imxrt-ral/imxrt1062,smoltcp/socket-udp
-
-  smoltcp-compat:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        smoltcp-version: ["0.12.0", "0.13.0"]
-    steps:
-    - uses: actions/checkout@v6
-    - run: rustup toolchain install stable --no-self-update --profile minimal --target thumbv7em-none-eabihf
-    - name: Pin smoltcp version
-      run: cargo update -p smoltcp --precise ${{ matrix.smoltcp-version }}
-    - name: Check the package
-      run: cargo check --features=imxrt-ral/imxrt1062,smoltcp/socket-udp --target=x86_64-unknown-linux-gnu --target=thumbv7em-none-eabihf
-    - name: Run tests
-      run: cargo test --features=imxrt-ral/imxrt1062,smoltcp/socket-udp
-
   docs:
     runs-on: ubuntu-latest
     env:

CHANGELOG.md

@@ -6,7 +6,7 @@
 
 First release to crates.io. Supports
 
-- imxrt-ral 0.5 and 0.6
-- smoltcp 0.12 and 0.13
+- imxrt-ral 0.6
+- smoltcp 0.13
 
 ENET\_1G is not supported.

Cargo.toml

@@ -14,12 +14,12 @@ categories = [
 ]
 
 [dependencies]
-imxrt-ral = ">=0.5,<=0.6"
+imxrt-ral = "0.6"
 mdio = "0.1"
 defmt = { version = "1.0", optional = true }
 
 [dependencies.smoltcp]
-version = ">=0.12,<=0.13"
+version = "0.13"
 default-features = false
 features = [
     "medium-ethernet",