harness: F52 emit main + bump vendor marker to +zib.2

run_213c_gdey0213f52_emit.cpp regenerates the F52 descriptor; vendor marker
bumped to record the F52 re-sync from the zGxEPD2 fork.

components/gxepd2/vendor/library.properties

@@ -1,5 +1,5 @@
 name=GxEPD2
-version=1.6.9+zib.1
+version=1.6.9+zib.2
 author=Jean-Marc Zingg
 maintainer=Jean-Marc Zingg
 sentence=Arduino Display Library for SPI E-Paper displays from Dalian Good Display and Waveshare.

tools/gxepd2_harness/run_213c_gdey0213f52_emit.cpp

@@ -0,0 +1,8 @@
+#include "emit_descriptor.h"
+
+#include "epd4c/GxEPD2_213c_GDEY0213F52.h"
+
+int main() {
+  emit::emit_descriptor<GxEPD2_213c_GDEY0213F52>("GxEPD2_213c_GDEY0213F52", "PANEL_213C_GDEY0213F52");
+  return 0;
+}