Update workflow to access aws for dependabot

[rugeli]

Problem

What is the problem this work solves, including
the analyze workflow fails to run for dependabot PRs due to credential errors, example

Solution

What I/we did to solve this problem

• added DEPENDABOT_AWS_ACCESS_KEY_ID and DEPENDABOT_AWS_SECRET_ACCESS_KEY to dependabot secrets
• updated analyze workflow to handle aws access for dependabot PRs

Note: I tested the workflow syntax on this branch but wasn't able to test dependabot PRs until we merge the changes to main and re-run the open dependabot pr for further testing.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

[github-actions]

Packing analysis report

Analysis for packing results located at cellpack/tests/outputs/test_spheres/spheresSST

Ingredient name	Encapsulating radius	Average number packed
ext_A	25	236.0

Packing image

Distance analysis

Expected minimum distance: 50.00
Actual minimum distance: 50.01

Ingredient key	Pairwise distance distribution
ext_A