fix: update ldap extension to use libldap2 for Debian Trixie

Debian Trixie uses the package name 'libldap2' (OpenLDAP 2.6.10) instead of
'libldap-2.5-0' from Bookworm. This caused "Package 'libldap-2.5-0' has no
installation candidate" errors when building the ldap extension on Trixie.

Changes:
- Update all Trixie ldap Dockerfiles: libldap-2.5-0 → libldap2
- Affects PHP 8.1, 8.2, 8.3, 8.4, 8.5 on Trixie
- Alpine versions remain unchanged

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: fox91

8.1/trixie/ldap/Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer="Andrea Falco <andrea@falco.sh>"
 # PHP ext-ldap
 RUN set -eux; \
   persistentDeps=" \
-    libldap-2.5-0 \
+    libldap2 \
   "; \
   buildDeps=" \
     libldap2-dev \

8.2/trixie/ldap/Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer="Andrea Falco <andrea@falco.sh>"
 # PHP ext-ldap
 RUN set -eux; \
   persistentDeps=" \
-    libldap-2.5-0 \
+    libldap2 \
   "; \
   buildDeps=" \
     libldap2-dev \

8.3/trixie/ldap/Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer="Andrea Falco <andrea@falco.sh>"
 # PHP ext-ldap
 RUN set -eux; \
   persistentDeps=" \
-    libldap-2.5-0 \
+    libldap2 \
   "; \
   buildDeps=" \
     libldap2-dev \

8.4/trixie/ldap/Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer="Andrea Falco <andrea@falco.sh>"
 # PHP ext-ldap
 RUN set -eux; \
   persistentDeps=" \
-    libldap-2.5-0 \
+    libldap2 \
   "; \
   buildDeps=" \
     libldap2-dev \

8.5/trixie/ldap/Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer="Andrea Falco <andrea@falco.sh>"
 # PHP ext-ldap
 RUN set -eux; \
   persistentDeps=" \
-    libldap-2.5-0 \
+    libldap2 \
   "; \
   buildDeps=" \
     libldap2-dev \