release: Update package.xml version to 2.6.4

12 jobs for master in 11 minutes and 32 seconds (queued for 4 seconds)
Name Stage Failure
failed
robotpkg-py-pinocchio-16.04 Test
/root/robotpkg/math/pinocchio/work/build.log
make[1]: *** [do-build] Error 2
/root/robotpkg/mk/build/build.mk:198: recipe for target 'do-build' failed
make: *** [do-depends] Error 1
/root/robotpkg/mk/depends/depends.mk:70: recipe for target 'do-depends' failed
make: *** [install] Error 2
/root/robotpkg/mk/internal/trusted.mk:36: recipe for target 'install' failed
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
robotpkg-pinocchio-16.04 Test
For details or bug reports, check the complete log file in:
/root/robotpkg/math/pinocchio/work/build.log

/root/robotpkg/mk/build/build.mk:198: recipe for target 'do-build' failed
make: *** [do-build] Error 2
make: *** [install] Error 2
/root/robotpkg/mk/internal/trusted.mk:36: recipe for target 'install' failed
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
format Test
./doc/d-practical-exercises/src/pendulum.py:188:1: W293 blank line contains whitespace
./models/simple_model.py:7:1: E402 module level import not at top of file
./models/simple_model.py:8:1: E402 module level import not at top of file
./models/simple_model.py:79:72: E231 missing whitespace after ','
./models/simple_model.py:100:9: E722 do not use bare 'except'
./models/simple_model.py:109:52: E231 missing whitespace after ','
./models/simple_model.py:140:1: E305 expected 2 blank lines after class or function definition, found 1
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1