samba4: update to 4.24.3

* add dotsrc.org mirror to master_sites

net/samba4/Portfile

@@ -12,11 +12,11 @@ name                samba4
 # With sbsat due to /opt/local/bin/gentest
 conflicts           samba3 sbsat
 # update talloc, tdb and tevent first
-version             4.24.0
-revision            1
-checksums           rmd160  6e3c3b1d058a2a01e1a2b8edfb77c346935989a5 \
-                    sha256  1b1e457fd651a612cd08226cc6efd04e5d01e36d918c8b4c4e470e74e86881ea \
-                    size    43386689
+version             4.24.3
+revision            0
+checksums           rmd160  ff94a7146fa89bd438baa98b8e96f98caf946b6e \
+                    sha256  4a5e0ed1ea192b798c873d9957c50a5767c10c2767cccb00d56ecc427e94f8e9 \
+                    size    43446520
 
 categories          net
 platforms           darwin freebsd
@@ -27,7 +27,10 @@ long_description    Samba is an software suite that provides seamless file \
                     and print services to SMB/CIFS clients.
 
 homepage            https://www.samba.org
-master_sites        https://download.samba.org/pub/samba/stable
+# fetching distfiles may be broken due to protection against AI crawlers
+# let's append a mirror by dotsrc.org
+master_sites        https://download.samba.org/pub/samba/stable \
+                    https://mirrors.dotsrc.org/samba/stable
 distname            samba-${version}
 
 set py_ver          3.14