gnu: nushell: Update to 0.27.0.

gnu: nushell: Update to 0.27.0.

* gnu/packages/shells.scm (nushell): Update to 0.27.0.
(rust-nu-cli-0.27):
(rust-nu-command-0.27):
(rust-nu-data-0.27):
(rust-nu-engine-0.27):
(rust-nu-errors-0.27):
(rust-nu-json-0.27):
(rust-nu-parser-0.27):
(rust-nu-plugin-0.27):
(rust-nu-plugin-binaryview-0.27):
(rust-nu-plugin-chart-0.27):
(rust-nu-plugin-fetch-0.27):
(rust-nu-plugin-from-bson-0.27):
(rust-nu-plugin-from-sqlite-0.27):
(rust-nu-plugin-inc-0.27):
(rust-nu-plugin-match-0.27):
(rust-nu-plugin-post-0.27):
(rust-nu-plugin-s3-0.27):
(rust-nu-plugin-sys-0.27):
(rust-nu-plugin-textview-0.27):
(rust-nu-plugin-to-bson-0.27):
(rust-nu-plugin-to-sqlite-0.27):
(rust-nu-plugin-tree-0.27):
(rust-nu-plugin-xpath-0.27):
(rust-nu-protocol-0.27):
(rust-nu-source-0.27):
(rust-nu-stream-0.27):
(rust-nu-test-support-0.27):
(rust-nu-value-ext-0.27): New variables.
(rust-nu-cli-0.26):
(rust-nu-command-0.26):
(rust-nu-data-0.26):
(rust-nu-engine-0.26):
(rust-nu-errors-0.26):
(rust-nu-json-0.26):
(rust-nu-parser-0.26):
(rust-nu-plugin-0.26):
(rust-nu-plugin-binaryview-0.26):
(rust-nu-plugin-chart-0.26):
(rust-nu-plugin-fetch-0.26):
(rust-nu-plugin-from-bson-0.26):
(rust-nu-plugin-from-sqlite-0.26):
(rust-nu-plugin-inc-0.26):
(rust-nu-plugin-match-0.26):
(rust-nu-plugin-post-0.26):
(rust-nu-plugin-s3-0.26):
(rust-nu-plugin-sys-0.26):
(rust-nu-plugin-textview-0.26):
(rust-nu-plugin-to-bson-0.26):
(rust-nu-plugin-to-sqlite-0.26):
(rust-nu-plugin-tree-0.26):
(rust-nu-plugin-xpath-0.26):
(rust-nu-protocol-0.26):
(rust-nu-source-0.26):
(rust-nu-stream-0.26):
(rust-nu-test-support-0.26):
(rust-nu-value-ext-0.26): Remove variables.