poky.yaml.in: add missing locales dependency

This is a requirement for building the documentation, otherwise we get
(on Ubuntu 24.04):

     File "/usr/lib/python3.12/locale.py", line 615, in setlocale
       return _setlocale(category, locale)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   locale.Error: unsupported locale setting

(From yocto-docs rev: cecf8bc678756790e9164000769e798be30d9d46)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit 0943a7b67ef0012b5d9badc15e0c579dbb9014ae)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

documentation/poky.yaml.in

@@ -63,6 +63,7 @@ UBUNTU_DEBIAN_HOST_PACKAGES_ESSENTIAL: >-
 UBUNTU_DEBIAN_HOST_PACKAGES_DOC: >-
   git
   inkscape
+  locales
   make
   python3-saneyaml
   python3-sphinx-rtd-theme
@@ -118,6 +119,7 @@ FEDORA_HOST_PACKAGES_ESSENTIAL: >-
 
 FEDORA_HOST_PACKAGES_DOC: >-
   git
+  glibc-locale-source
   inkscape
   make
   python3-pip
@@ -158,6 +160,7 @@ OPENSUSE_PIP3_HOST_PACKAGES_ESSENTIAL: GitPython
 
 OPENSUSE_HOST_PACKAGES_DOC: >-
   git
+  glibc-i18ndata
   inkscape
   make
   python3-pip
@@ -204,6 +207,7 @@ ALMALINUX_HOST_PACKAGES_ESSENTIAL: >-
 
 ALMALINUX_HOST_PACKAGES_DOC: >-
   git
+  glibc-locale-source
   inkscape
   make
   python3-pip