Set Workflow Permissions (#62)

## Describe your changes
Defining permissions for workflows

## Issue ticket number and link

https://github.com/Bayer-Group/react-color-a11y/security/code-scanning/13

https://github.com/Bayer-Group/react-color-a11y/security/code-scanning/14

https://github.com/Bayer-Group/react-color-a11y/security/code-scanning/15

https://github.com/Bayer-Group/react-color-a11y/security/code-scanning/16

## Checklist before requesting a review
- [x] I have performed a self-review of my code
- [x] If it is a core feature, I have added thorough tests.

Author: lounsbrough

.github/workflows/pr-tests.yml

@@ -4,6 +4,10 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
   run-tests:
     runs-on: ubuntu-latest

.github/workflows/publish-new-release.yml

@@ -4,6 +4,10 @@ on:
   release:
     types: [created]
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   run-tests:
     runs-on: ubuntu-latest