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Error when updating pip packages

See original GitHub issue

About 5-10 days ago dependabot pipeline started failing for python packages, which have updated versions. There is no specific dependency which triggers this failure, basically any dependency update will result in similar stracktrace as below.

Stacktrace

Task         : Dependabot
Description  : Automatically update dependencies and vulnerabilities in your code
Version      : 1.14.420
Author       : Tingle Software
Help         : For help please visit https://github.com/tinglesoftware/dependabot-azure-devops
==============================================================================
/usr/bin/docker run --rm -i -e GITHUB_ACCESS_TOKEN=*** -e DEPENDABOT_PACKAGE_MANAGER=pip -e DEPENDABOT_OPEN_PULL_REQUESTS_LIMIT=10 -e DEPENDABOT_DIRECTORY=/ -e DEPENDABOT_VERSIONING_STRATEGY=auto -e DEPENDABOT_MILESTONE=115080 -e DEPENDABOT_EXTRA_CREDENTIALS=[{"type":"docker_registry","url":null,"registry":"<redacted>azurecr.io","username":"AzureDevopsDependabot","password":"***"}] -e DEPENDABOT_FAIL_ON_EXCEPTION=true -e AZURE_ORGANIZATION=<redacted> -e AZURE_PROJECT=<redacted> -e AZURE_REPOSITORY=<redacted> -e AZURE_ACCESS_TOKEN=*** -e AZURE_MERGE_STRATEGY=squash -e DEPENDABOT_FAIL_ON_EXCEPTION=false tingle/dependabot-azure-devops:0.14
warning: parser/current is loading parser/ruby31, which recognizes3.1.3-compliant syntax, but you are running 3.1.2.
Please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
GitHub access token has been provided.
Fetching GitHub's GraphQL schema (should only happen once per run)
Using '[https://dev.azure.com:443/'](https://dev.azure.com/') as API endpoint
Pull Requests shall be linked to milestone (work item) 115080
Working in <redacted>/_git/<redacted>, 'default' branch under '/' directory
Looking for configuration file in the repository ...
.......
Using configuration file at '/.github/dependabot.yml' 😎
Using 'auto' requirements update strategy
Fetching pip dependency files ...
.......
.......
Found 4 dependency file(s) at commit 4d5b321973718f669df4f76af0f0feda3219f42d
 - /requirements-dev.txt
 - /requirements-tests.txt
 - /requirements.txt
 - /setup.py
Parsing dependencies information
Found 24 dependencies
.......
Checking if matplotlib 3.6.3 needs updating
🌍 --> GET https://pypi.org/simple/matplotlib/
🌍 <-- 200 ://pypi.org:443/simple/matplotlib/
🌍 --> GET https://pypi.org/simple/matplotlib/
🌍 <-- 200 ://pypi.org:443/simple/matplotlib/
Error working on updates for matplotlib 3.6.3 (continuing)
/home/dependabot/dependabot-script/vendor/ruby/3.1.0/gems/dependabot-common-0.215.0/lib/dependabot/update_checkers/base.rb:269:in `block in preferred_version_resolvable_with_unlock?': undefined method `[]' for nil:NilClass (NoMethodError)

        updated_requirements.none? { |r| r[:requirement] == :unfixable }
                                          ^^^^^^^^^^^^^^
	from /home/dependabot/dependabot-script/vendor/ruby/3.1.0/gems/dependabot-common-0.215.0/lib/dependabot/update_checkers/base.rb:269:in `none?'
	from /home/dependabot/dependabot-script/vendor/ruby/3.1.0/gems/dependabot-common-0.215.0/lib/dependabot/update_checkers/base.rb:269:in `preferred_version_resolvable_with_unlock?'
	from /home/dependabot/dependabot-script/vendor/ruby/3.1.0/gems/dependabot-python-0.215.0/lib/dependabot/python/update_checker.rb:126:in `preferred_version_resolvable_with_unlock?'
	from /home/dependabot/dependabot-script/vendor/ruby/3.1.0/gems/dependabot-common-0.215.0/lib/dependabot/update_checkers/base.rb:252:in `numeric_version_can_update?'
	from /home/dependabot/dependabot-script/vendor/ruby/3.1.0/gems/dependabot-common-0.215.0/lib/dependabot/update_checkers/base.rb:202:in `version_can_update?'
	from /home/dependabot/dependabot-script/vendor/ruby/3.1.0/gems/dependabot-common-0.215.0/lib/dependabot/update_checkers/base.rb:44:in `can_update?'
	from ./update-script.rb:551:in `block in <main>'
	from ./update-script.rb:503:in `each'
	from ./update-script.rb:503:in `<main>'
.......

.github/dependabot.yml

version: 2
updates:

- package-ecosystem: "pip"
  directory: "/"
  open-pull-requests-limit: 10
  milestone: 115080
  versioning-strategy: "auto"

- package-ecosystem: "docker"
  directory: "/"
  open-pull-requests-limit: 10
  milestone: 115080
  versioning-strategy: "auto"

registries:
  ob-acr:
    type: docker-registry
    url: redacted
    username: AzureDevopsDependabot
    password: ${{ ACR_PASSWORD }}