Bump libc from 0.2.65 to 0.2.66 (#7180)

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.65 to 0.2.66.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](https://github.com/rust-lang/libc/compare/0.2.65...0.2.66)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

ledger/Cargo.toml

@@ -21,7 +21,7 @@ sha2 = "0.8.0"
 fs_extra = "1.1.0"
 itertools = "0.8.2"
 lazy_static = "1.4.0"
-libc = "0.2.65"
+libc = "0.2.66"
 log = { version = "0.4.8" }
 rand = "0.6.5"
 rand_chacha = "0.1.1"