dev-*/*: update for virtual/zlib

Update done using:

```
git grep -l sys-libs/zlib dev-* | xargs sed -i -e s@sys-libs/zlib@virtual/zlib@g
git diff --name-only | xargs copybump
git diff --name-only | xargs grep -l PYTHON_COMPAT | xargs gpy-impl -@dead
pkgcheck scan --commits -c SourcingCheck,VisibilityCheck --exit error
```

Followed by manual revert in dev-python/zlib-ng where it accidentally
caught sys-libs/zlib-ng dependencies.

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-php/pecl-http/pecl-http-4.2.6.ebuild

@@ -23,7 +23,7 @@ COMMON_DEPEND="app-arch/brotli:=
 	dev-libs/libevent
 	>=dev-php/pecl-raphf-2.0.1:7[php_targets_php8-2(-)?,php_targets_php8-3(-)?]
 	net-dns/libidn2
-	sys-libs/zlib
+	virtual/zlib
 	ssl? ( net-misc/curl[ssl,curl_ssl_gnutls(-)=,curl_ssl_openssl(-)=] )
 	!ssl? ( net-misc/curl[-ssl] )
 "

dev-php/pecl-memcached/pecl-memcached-3.3.0.ebuild

@@ -28,7 +28,7 @@ for slot in ${USE_PHP} ; do
 done
 
 COMMON_DEPEND="|| ( dev-libs/libmemcached-awesome[sasl(-)?] >=dev-libs/libmemcached-1.0.14[sasl(-)?] )
-	sys-libs/zlib
+	virtual/zlib
 	igbinary? ( ${IGBINARY_DEPEND} )
 "
 DEPEND="${COMMON_DEPEND}"

dev-php/pecl-memcached/pecl-memcached-3.4.0.ebuild

@@ -28,7 +28,7 @@ for slot in ${USE_PHP} ; do
 done
 
 COMMON_DEPEND="|| ( dev-libs/libmemcached-awesome[sasl(-)?] >=dev-libs/libmemcached-1.0.14[sasl(-)?] )
-	sys-libs/zlib
+	virtual/zlib
 	igbinary? ( ${IGBINARY_DEPEND} )
 "
 DEPEND="${COMMON_DEPEND}"