cargo: allow openssl 0.10.46

Reword version range to prevent Dependabot from continually trying to bump the lower bound.

Cargo.toml

@@ -43,7 +43,7 @@ mailparse = ">= 0.13, < 0.15"
 maplit = "1.0"
 nix = ">= 0.19, < 0.27"
 openssh-keys = ">= 0.5, < 0.7"
-openssl = "0.10.54"
+openssl = ">= 0.10.46, < 0.11"
 pnet_base = ">= 0.26, < 0.34"
 pnet_datalink = ">= 0.26, < 0.34"
 reqwest = { version = ">= 0.10, < 0.12", features = [ "blocking" ] }