ci: switch to pkgconf on macOS

Change-Id: I5a2dbd6346236361e8077e995e7c8da503501b3c
diff --git a/.jenkins.d/00-deps.sh b/.jenkins.d/00-deps.sh
index f12feaa..7a98432 100755
--- a/.jenkins.d/00-deps.sh
+++ b/.jenkins.d/00-deps.sh
@@ -20,7 +20,7 @@
     pkg-config
     python3
 )
-FORMULAE=(boost openssl pkg-config)
+FORMULAE=(boost openssl pkgconf)
 PIP_PKGS=()
 case $JOB_NAME in
     *code-coverage)