Use pip3 instead of pip #14540

Job	Run time
Don't run scheduled jobs on forks	1s
Test ROS 2 packages in repository (macOS-latest, humble)	5m 32s
Test ROS 2 packages in repository (macOS-latest, iron)	4m 16s
Test with rosdep-skip-keys option	5m 46s
Test ROS package (noetic)	1m 53s
Test ROS 2 packages in repository (macOS-latest, jazzy)	3m 58s
Test ROS 2 humble package with ROS dependencies	4m 55s
Test ROS 2 packages in repository (windows-2019, humble)	19m 39s
Test ROS 2 packages in repository (windows-2019, iron)	17m 23s
Test ROS 2 packages in repository (windows-2019, jazzy)	13m 27s
ROS 2 Docker (humble)	3m 56s
Test rosdep check/skip install options	2m 6s
ROS 2 Docker (iron)	4m 31s
ROS 2 from source (ubuntu:22.04, humble)	10m 27s
ROS 2 Docker (jazzy)	4m 31s
ROS 2 from source (ubuntu:22.04, iron)	9m 57s
ROS 2 Docker (rolling)	4m 36s
ROS 2 from source (ubuntu:24.04, jazzy)	14m 43s
Test with private repos	4m 10s
ROS 2 from source (ubuntu:24.04, rolling)	13m 1s
ROS 2 from source (windows-2019, humble)	22m 27s
ROS 2 from source (windows-2019, iron)	21m 49s
Test ROS 2 from source Docker (humble)	18m 29s
ROS 2 from source (windows-2019, jazzy)	26m 16s
Test ROS 2 from source Docker (iron)	19m 23s
Test ROS 2 from source Docker (jazzy)	22m 41s
ROS 2 from source (windows-2019, rolling)	23m 18s
Test ROS 2 from source Docker (rolling)	21m 51s
ROS 2 from source (macOS-latest, humble)	3m 46s
ROS 2 from source (macOS-latest, iron)	3m 45s
ROS 2 from source (macOS-latest, jazzy)	4m 21s
ROS 2 from source (macOS-latest, rolling)	4m 27s
	5h 41m 21s

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