cargo: bump libc from 0.2.95 to 0.2.97

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.95 to 0.2.97.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](https://github.com/rust-lang/libc/compare/0.2.95...0.2.97)

---
updated-dependencies:
- dependency-name: libc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.lock

@@ -2128,9 +2128,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.95"
+version = "0.2.97"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "789da6d93f1b866ffe175afc5322a4d76c038605a1c3319bb57b06967ca98a36"
+checksum = "12b8adadd720df158f4d70dfe7ccc6adb0472d7c55ca83445f6a5ab3e36f8fb6"
 
 [[package]]
 name = "libm"

Cargo.toml

@@ -40,7 +40,7 @@ indexmap = "1.3.0"
 itertools = "0.10.1"
 kamadak-exif = "0.5"
 lettre_email = { git = "https://github.com/deltachat/lettre", branch = "master" }
-libc = "0.2.95"
+libc = "0.2.97"
 log = {version = "0.4.8", optional = true }
 mailparse = "0.13.4"
 native-tls = "0.2.3"