Avoid cargo 1.43–1.45 in GitHub Actions

These versions are incompatible with some recent GitHub change

    error: failed to get `indexmap` as a dependency of package `serde_json v1.0.82 (/home/runner/work/json/json)`

    Caused by:
      failed to load source for dependency `indexmap`

    Caused by:
      Unable to update registry `https://github.com/rust-lang/crates.io-index`

    Caused by:
      failed to fetch `https://github.com/rust-lang/crates.io-index`

    Caused by:
      error reading from the zlib stream; class=Zlib (5)

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [beta, 1.56.1, 1.53.0, 1.46.0, 1.45.0, 1.40.0, 1.38.0, 1.36.0]
+        rust: [beta, 1.56.1, 1.53.0, 1.46.0, 1.40.0, 1.38.0, 1.36.0]
         os: [ubuntu]
         include:
           - rust: stable