Update NPM packages incl. Hugo to 0.140.2

[chalin]

• Upgrades Hugo to 0.140.2, as well as most other packages
• No change to the generated site files other than the Hugo version ID, and the diff shown below. I'll have to investigate further to see if we can drop the Docsy-local copy of vendor/_rfs.scss.

diff --git a/scss/main.css.map b/scss/main.css.map
index de81972b4c..acb2dd6eba 100644
--- a/scss/main.css.map
+++ b/scss/main.css.map
@@ -17,7 +17,7 @@
                "themes/docsy/node_modules/bootstrap/scss/_variables-dark.scss",
                "themes/docsy/node_modules/bootstrap/scss/_maps.scss",
                "themes/docsy/node_modules/bootstrap/scss/_mixins.scss",
-               "themes/docsy/assets/_vendor/bootstrap/scss/_rfs.scss",
+               "themes/docsy/node_modules/bootstrap/scss/vendor/_rfs.scss",
                "themes/docsy/node_modules/bootstrap/scss/mixins/_deprecate.scss",
                "themes/docsy/node_modules/bootstrap/scss/mixins/_breakpoints.scss",
                "themes/docsy/node_modules/bootstrap/scss/mixins/_color-mode.scss",

Docsy issue reference:

• Do we still need the local copy of vendor/_rfs.scss? google/docsy#2152