gnu: inkscape: Rename variable to inkscape/stable and hide package.

This will allow introducing a new 'inkscape' package that can be more freely
upgraded on the main branch.

* gnu/packages/inkscape.scm (inkscape): Rename to...
(inkscape/stable): ... this, and make it a hidden package.
* gnu/packages/admin.scm (wpa-supplicant-gui)[native-inputs]: Rename inkscape
input accordingly.
* gnu/packages/docbook.scm (dblatex): Likewise.
* gnu/packages/gnome-xyz.scm (arc-theme): Likewise.
* gnu/packages/python-xyz.scm (python-matplotlib-documentation): Likewise.
(python-nbconvert): Likewise.
* gnu/packages/xfce.scm (xfdesktop): Likewise.
* gnu/packages/xorg.scm (hackneyed-x11-cursors): Likewise.

gnu/packages/admin.scm

@@ -2144,7 +2144,7 @@ command.")
     (native-inputs
      ;; For icons.
      (modify-inputs (package-native-inputs wpa-supplicant)
-       (prepend imagemagick inkscape)))
+       (prepend imagemagick inkscape/stable)))
     (arguments
      `(#:phases (modify-phases %standard-phases
                   (add-after 'unpack 'chdir

gnu/packages/docbook.scm

@@ -506,7 +506,7 @@ the in DocBook SGML DTDs.")
 
                                              texlive-generic-iftex)))
        ("imagemagick" ,imagemagick)     ;for convert
-       ("inkscape" ,inkscape)           ;for svg conversion
+       ("inkscape" ,inkscape/stable)    ;for svg conversion
        ("docbook" ,docbook-xml)
        ("libxslt" ,libxslt)))           ;for xsltproc
     (arguments

gnu/packages/gnome-xyz.scm

@@ -1109,7 +1109,7 @@ of windows.")
      (list `(,glib "bin") ; for glib-compile-resources
            gnome-shell
            gtk+
-           inkscape
+           inkscape/stable
            optipng
            pkg-config
            sassc/libsass-3.5))

gnu/packages/inkscape.scm

@@ -52,7 +52,10 @@
   #:use-module (gnu packages image)
   #:use-module (gnu packages pkg-config))
 
-(define-public inkscape
+;;; A variant of Inkscape intended to be bumped only on core-updates, to avoid
+;;; rebuilding 2k+ packages through dblatex.
+(define-public inkscape/stable
+  (hidden-package
    (package
      (name "inkscape")
      (version "1.1.1")
@@ -233,4 +236,4 @@ endif()~%~%"
      (description "Inkscape is a vector graphics editor.  What sets Inkscape
 apart is its use of Scalable Vector Graphics (SVG), an XML-based W3C standard,
 as the native format.")
-    (license license:gpl3+)))           ;see the file COPYING
+     (license license:gpl3+))))           ;see the file COPYING

gnu/packages/python-xyz.scm

@@ -6455,7 +6455,7 @@ toolkits.")
                          (string-append info "/matplotlib-figures"))))))))
     (native-inputs
      (list graphviz
-           inkscape
+           inkscape/stable
            python-colorspacious
            python-mpl-sphinx-theme
            python-scipy
@@ -13148,7 +13148,7 @@ time.")
                            "and not test_execute_widgets_from_nbconvert "
                            "and not test_execute_multiple_notebooks ")))))))))
     (inputs
-     (list inkscape pandoc))
+     (list inkscape/stable pandoc))
     (native-inputs
      (list python-ipykernel
            ;; Adding ipywidgets would create a cycle.

gnu/packages/xfce.scm

@@ -862,11 +862,11 @@ on the screen.")
                                   "backgrounds/xfce-verticals.png"))
                       #t)))
 
-       #:disallowed-references (,inkscape ,imagemagick)))
+       #:disallowed-references (,inkscape/stable ,imagemagick)))
     (native-inputs
      (list pkg-config intltool
            ;; For our own ‘prepare-background-image’ phase.
-           inkscape imagemagick))
+           inkscape/stable imagemagick))
     (inputs
      (list exo
            garcon

gnu/packages/xorg.scm

@@ -2206,7 +2206,7 @@ X server: @code{handhelds}, @code{redglass} and @code{whiteglass}.")
            (lambda* (#:key make-flags #:allow-other-keys)
              (apply invoke `("make" "install" ,@make-flags
                              "THEME_NAME=Hackneyed-Dark")))))))
-    (native-inputs (list imagemagick inkscape xcursorgen))
+    (native-inputs (list imagemagick inkscape/stable xcursorgen))
     (home-page "https://gitlab.com/Enthymeme/hackneyed-x11-cursors")
     (synopsis "Classic cursor theme for X11")
     (description "Hackneyed is a scalable cursor theme mildly resembling old