Update PR template include changelog instructions

[i-oden]

Before submitting this PR

1. Description: Since we have changed the changelog to sprintlog, and are now using a CHANGELOG.rst file for version changelogs, we need to include the updating of this file to the release instructions.
2. Jira task / GitHub issue: DDS-1504
3. How to test: X
4. Type of change: Check the relevant boxes in the section below
5. Add docstrings and comments to code, even if you personally think it's obvious.

What type of change(s) does the PR contain?

• New feature
  • Breaking: Please describe the reason for the break and how we can fix it.
  • Non-breaking
• Bug fix
  • Breaking: Please describe the reason for the break and how we can fix it.
  • Non-breaking
• Security Alert fix
• Documentation
• Tests (only)
• Workflow

Checklist

• Sprintlog
  • Added
  • Not needed (E.g. PR contains only tests)
• Rebase / Update / Merge from base branch (the branch from which the current is forked)
  • Done
  • Not needed
• Blocking PRs
  • Merged
  • No blocking PRs
• PR to master branch
  • Yes: Read the release instructions
    • I have followed steps 1-6.
  • No

Actions / Scans

• Black: Python code formatter. Does not execute. Only tests.
  Run black . locally to execute formatting.
  • Passed
• Prettier: General code formatter. Our use case: MD and yaml mainly.
  Run npx prettier --write . locally to execute formatting.
  • Passed
• Yamllint: Linting of yaml files.
  • Passed
• Tests: Pytest to verify that functionality works as expected.
  • New tests added
  • No new tests
  • Passed
• TestPyPi: Build CLI and publish to TestPyPi in order to verify before release.
  • Passed
• CodeQL: Scan for security vulnerabilities, bugs, errors
  • New alerts: Go through them and either fix, dismiss och ignore. Add reasoning in items below.
  • Alerts fixed: What?
  • Alerts ignored / dismissed: Why?
  • Passed
• Trivy: Security scanner
  • New alerts: Go through them and either fix, dismiss och ignore. Add reasoning in items below.
  • Alerts fixed: What?
  • Alerts ignored / dismissed: Why?
  • Passed
• Snyk: Security scanner
  • New alerts: Go through them and either fix, dismiss och ignore. Add reasoning in items below.
  • Alerts fixed: What?
  • Alerts ignored / dismissed: Why?
  • Passed

[codecov]

Codecov Report

Merging #622 (d5c9172) into dev (63e160f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #622   +/-   ##
=======================================
  Coverage   46.64%   46.64%           
=======================================
  Files          31       31           
  Lines        2785     2785           
=======================================
  Hits         1299     1299           
  Misses       1486     1486           

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