Replace obsolete PCRE packages

pcre3 was removed from recent debian-based releases (eg. Trixie[1]),
while RHEL10/CentOS Stream 10 no longer ships pcre in favor of pcre2.

Use the latest whereto library release (0.5.0) which uses pcre2
instead.

[1] https://lists.debian.org/debian-devel/2021/11/msg00176.html

Depends-on: https://review.opendev.org/c/openstack/requirements/+/971428
Change-Id: Ibf96fca5c25e4b26ce35d9aef0d7f06b28cb391b
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

bindep.txt

@@ -18,5 +18,5 @@ python3-all-dev [platform:ubuntu !platform:ubuntu-precise]
 python3-dev [platform:dpkg]
 python3-devel [platform:fedora]
 uuid-dev [platform:dpkg]
-libpcre3-dev [platform:dpkg doc]
-pcre-devel [platform:rpm doc]
+libpcre2-dev [platform:dpkg doc]
+pcre2-devel [platform:rpm doc]

doc/requirements.txt

@@ -4,4 +4,4 @@ reno>=3.1.0 # Apache-2.0
 sphinxcontrib-apidoc>=0.2.0 # BSD
 
 # redirect tests in docs
-whereto>=0.3.0 # Apache-2.0
+whereto>=0.5.0 # Apache-2.0