Update Bison (build) dependency for flex built with system compiler to v3.5.3

[justbennet]

(created using eb --new-pr)

edit (@boegel): main motivation here is avoiding to have multiple Bison versions installed with system compiler when bootstrapping GCCcore...

It's OK to make this change since it's only a build dependency (it can't cause any runtime conflicts).

[boegel]

@boegelbot please test @ generoso

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
gligar04.gastly.os - Linux centos linux 7.9.2009, x86_64, Intel(R) Xeon(R) Gold 6130 CPU @ 2.10GHz (skylake_avx512), Python 3.6.8
See https://gist.github.com/b8a6e03c42a2fe771dfb6e3ed05850bd for a full test report.

[boegel]

lgtm

[boegelbot]

@boegel: Request for testing this PR well received on generoso

PR test command 'EB_PR=12111 EB_ARGS= /apps/slurm/default/bin/sbatch --job-name test_PR_12111 --ntasks=4 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 13799

Test results coming soon (I hope)...

- notification for comment with ID 775479720 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
generoso-c1-s-1 - Linux centos linux 8.2.2004, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz (haswell), Python 3.6.8
See https://gist.github.com/57e11c2c89b4c10296b6fbbc7fa7cdd6 for a full test report.

[boegel]

Going in, thanks @justbennet!