chore: Fix quotes in `flake.nix` for release values

- Fix the quotes in `flake.nix` for `ldflags` by adding escaped quotes around the values

flake.nix

@@ -64,8 +64,8 @@
             vendorSha256 = "sha256-81IBG8H1jsYKD+tmFeCpAWFdz6cuQDt9r+FV56xboBU=";
             
             ldflags = [
-                 "-X release.version=${version}"
-                 "-X release.build=${build}"
+                 "-X \"release.version=${version}\""
+                 "-X \"release.build=${build}\""
                       ];
                       
             buildInputs = [ versionTool.defaultPackage.${system} ];