[jsk_rosbag_tools] Fixed pillow version

[iory]

Related to #1798

In the course of addressing a build failure related to dependency resolution within our jsk_rosbag_tools package, we encountered an error indicating that pip-compile was unable to properly identify the version of the Pillow package required by imageio==2.34.0 as part of the moviepy==1.0.3 dependency. The error specifically pointed out that the package name or version was not recognized properly, which led to a halt in the dependency resolution process and subsequently the build process.

To resolve this issue, we've explicitly pinned the Pillow version to 8.4.0 in the requirements.in file. This action was taken after thoroughly investigating the underlying problem, which suggested that an explicit declaration could help pip-compile in resolving the correct package version and thus, facilitate a smoother dependency resolution process. Here's the commit that addresses this problem:

[k-okada]

CI passed!!!