Update MSRV to 1.54.0

Closes #740

.github/workflows/cbindgen.yml

@@ -41,11 +41,11 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: 1.40.0
+        toolchain: 1.54.0
 
     - name: Build with minimum supported Rust version
       run: |
-        cargo +1.40.0 test nonexistent-test --verbose
+        cargo +1.54.0 test nonexistent-test --verbose
 
   build:
 

Cargo.lock

@@ -51,9 +51,9 @@ checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
 [[package]]
 name = "clap"
-version = "3.1.4"
+version = "3.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "759e998e8d87a8b7a2c11a0e029d8772632fd3346ee4c770fb42f7fbbab76180"
+checksum = "d8c93436c21e4698bacadf42917db28b23017027a4deccb35dbe47a7e7840123"
 dependencies = [
  "atty",
  "bitflags",
@@ -383,9 +383,9 @@ dependencies = [
 
 [[package]]
 name = "textwrap"
-version = "0.14.2"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0066c8d12af8b5acd21e00547c3797fde4e8677254a7ee429176ccebbe93dd80"
+checksum = "b1141d4d61095b28419e22cb0bbf02755f5e54e0526f97f1e3d1d160e60885fb"
 
 [[package]]
 name = "toml"