Fix errant ldap3 dependency in src/core.

Signed-off-by: Jason Volk <jason@zemos.net>

Cargo.lock

@@ -4903,7 +4903,6 @@ dependencies = [
  "ipaddress",
  "itertools 0.14.0",
  "jsonwebtoken",
- "ldap3",
  "libc",
  "libloading",
  "log",

src/core/Cargo.toml

@@ -79,7 +79,6 @@ http.workspace = true
 ipaddress.workspace = true
 itertools.workspace = true
 jsonwebtoken.workspace = true
-ldap3.workspace = true
 libc.workspace = true
 libloading.workspace = true
 libloading.optional = true