chore: Update CI to run against rust 1.61

Newer versions of memchr requires this more recent version of rust, so to keep things simple we just keep pace here (the minimum rust version is just to guard against using too recent features of rust)

.github/workflows/rust.yml

@@ -13,7 +13,7 @@ jobs:
   build:
     strategy:
       matrix:
-        rust: [1.51.0, stable, beta, nightly]
+        rust: [1.61.0, stable, beta, nightly]
     env:
       CARGO_INCREMENTAL: 0 # Incremental compilation is slower and bloats the cache
       RUST_BACKTRACE: 1
@@ -29,17 +29,17 @@ jobs:
         toolchain: ${{ matrix.rust }}
         override: true
 
-    - name: Build
+    https://github.com/Marwes/combine/pull/360- name: Build
       run: cargo build
 
-    - name: Check 1.51
-      if: ${{ matrix.rust == '1.51.0' }}
+    - name: Check 1.61
+      if: ${{ matrix.rust == '1.61.0' }}
       run: |
         cargo "$@" check
         cargo "$@" check --no-default-features
 
     - name: Run tests
-      if: ${{ matrix.rust != '1.51.0' }}
+      if: ${{ matrix.rust != '1.61.0' }}
       run: ./ci.sh
 
     - name: Check docs