rustPlatform.buildRustPackage: cleaner output on verifyCargoDeps (#77567)

When this fails, the user may want to copy-paste the path to the "bad"
Cargo.lock file to inspect. The trailing `.` on `$cargoDeps.` gets caught in
most terminal copy-pastes. Since half the lines already don't have it, this
removes it from all of them for consistent output.

pkgs/build-support/rust/default.nix

@@ -100,9 +100,9 @@ stdenv.mkDerivation (args // {
   '' + stdenv.lib.optionalString verifyCargoDeps ''
     if ! diff source/Cargo.lock $cargoDeps/Cargo.lock ; then
       echo
-      echo "ERROR: cargoSha256 is out of date."
+      echo "ERROR: cargoSha256 is out of date"
       echo
-      echo "Cargo.lock is not the same in $cargoDeps."
+      echo "Cargo.lock is not the same in $cargoDeps"
       echo
       echo "To fix the issue:"
       echo '1. Use "1111111111111111111111111111111111111111111111111111" as the cargoSha256 value'