address review: reorder list in posix-deps-apt.sh

Author: skirpichev

.github/workflows/posix-deps-apt.sh

@@ -19,6 +19,7 @@ apt-get -yq install \
     libgdbm-dev \
     libgdbm-compat-dev \
     liblzma-dev \
+    libmpdec-dev \
     libncurses5-dev \
     libreadline6-dev \
     libsqlite3-dev \
@@ -30,5 +31,4 @@ apt-get -yq install \
     tk-dev \
     uuid-dev \
     xvfb \
-    zlib1g-dev \
-    libmpdec-dev
+    zlib1g-dev