Downgrade blkid hard requirement due to nixpkgs issues

2.40.1 is still a soft requirement as format will refuse
to run without a flag.

nixpkgs requiring macOS compatibility of util-linux is a questionable
choice.

See:
- https://github.com/NixOS/nixpkgs/pull/333467
- https://github.com/util-linux/util-linux/pull/3013

Rationale for picking blkid 2.39.3:
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.39/v2.39.3-ReleaseNotes

Cargo.toml

@@ -38,7 +38,8 @@ system-deps = "7"
 
 [package.metadata.system-deps]
 # libaio is missing a pkg-config file
-blkid = "2.40.1"
+# blkid/util-linux 2.40.1 is recommended
+blkid = "2.39.3"
 fuse3 = { version = "3.14", feature = "fuse" }
 libkeyutils = "1.6.3"
 liblz4 = "1.9.4"
@@ -46,7 +47,7 @@ libsodium = "1.0.18"
 libudev = "252"
 liburcu = "0.13"
 libzstd = "1.5.4"
-uuid = "2.40.1"
+uuid = "2.39.3"
 zlib = "1.2.13"
 
 [profile.release]