ci(nix): update attic public key

.gitlab-ci.yml

@@ -26,7 +26,7 @@ before_script:
 
   # Add our own binary cache
   - if command -v nix > /dev/null; then echo "extra-substituters = https://attic.conduit.rs/conduit" >> /etc/nix/nix.conf; fi
-  - if command -v nix > /dev/null; then echo "extra-trusted-public-keys = conduit:ddcaWZiWm0l0IXZlO8FERRdWvEufwmd0Negl1P+c0Ns=" >> /etc/nix/nix.conf; fi
+  - if command -v nix > /dev/null; then echo "extra-trusted-public-keys = conduit:zXpsVmtm+MBbweaCaG/CT4pCEDDjfFAKjgbCqfDBjLE=" >> /etc/nix/nix.conf; fi
 
   # Add alternate binary cache
   - if command -v nix > /dev/null && [ -n "$ATTIC_ENDPOINT" ]; then echo "extra-substituters = $ATTIC_ENDPOINT" >> /etc/nix/nix.conf; fi