Speedup boost recipe package_info by caching dependencies file

[mathbunnyru]

Specify library name and version: boost/all

Fix: #4203

The file with dependencies was read on each call to self._dependencies.
It never changes, so I decided to cache it, and it gave a good speedup and 6 seconds waiting during package_info is gone.

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[ghost]

I detected other pull requests that are modifying boost/all recipe:

• [boost] b2 user-config.jam needs CXX binary to be quoted as path may contain spaces #4149
• [boost] debug_level=0 should emit -d0 #4121
• Boost/1.72.0/mpi #3959
• boost: patch serialization sources #3918
• Boost: Change assertions to warnings #3900
• Add --disable-icu flag for iconv backend #3855
• boost: Correct --disable-iconv option #2657

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[TheStormN]

Is the CI broken or something? Before I was able to see the status of the builds...

P.S. @mathbunnyru you also need to fill the checkboxes. :)

[mathbunnyru]

Is the CI broken or something? Before I was able to see the status of the builds...

P.S. @mathbunnyru you also need to fill the checkboxes. :)

Filling checkboxes is not necessary, believe me :)
I don't think many check them.
I think they are made for the newcomers, who want to create first PR.

[madebr]

Filling checkboxes is not necessary, believe me :)
I don't think many check them.
I think they are made for the newcomers, who want to create first PR.

@mathbunnyru is a bad boy, living by his own rules 🤣
Great pr btw, I didn't think that the file was reread and reparsed that many times in package_info.

[conan-center-bot]

All green in build 1 (b7d9a00739975986da7a43b28983197f71bb9f9d)! 😊

• boost/1.69.0: Generated 131 packages. All logs here
• boost/1.70.0: Generated 131 packages. All logs here
• boost/1.71.0: Generated 131 packages. All logs here
• boost/1.72.0: Generated 131 packages. All logs here
• boost/1.73.0: Generated 131 packages. All logs here
• boost/1.74.0: Generated 131 packages. All logs here
• boost/1.75.0: Generated 131 packages. All logs here

[prince-chrismc]

Is the CI broken or something? Before I was able to see the status of the builds...

You need to check the messages posted by the bot #4319 (comment)

[SSE4]

check-boxes are just more or less a reminder for contributors, it's not required to mark them, it's just to not forget about running these steps

[TheStormN]

Is the CI broken or something? Before I was able to see the status of the builds...

You need to check the messages posted by the bot #4319 (comment)

Sure, but before I was able to directly open them in the CI, which gives you the information in much more comfortable variant.