Remove dependency on https://repo.spring.io/plugins-release

It turns out the repository is required for a plugin that the project
does not use. This commit removes the declaration and adapt CI
accordingly.

Closes gh-1813

.github/actions/build/action.yml

@@ -20,12 +20,6 @@ inputs:
     description: 'Java version to compile and test with'
     required: false
     default: '17'
-  opensource-repository-password:
-    description: 'Password for authentication with the open-source repository'
-    required: false
-  opensource-repository-username:
-    description: 'Username for authentication with the open-source repository'
-    required: false
   publish:
     description: 'Whether to publish artifacts ready for deployment to Artifactory'
     required: false
@@ -52,17 +46,11 @@ runs:
       id: build
       if: ${{ inputs.publish == 'false' }}
       shell: bash
-      env:
-        SPRING_REPOSITORY_PASSWORD: ${{ inputs.opensource-repository-password }}
-        SPRING_REPOSITORY_USERNAME: ${{ inputs.opensource-repository-username }}
       run: ./gradlew check
     - name: Publish
       id: publish
       if: ${{ inputs.publish == 'true' }}
       shell: bash
-      env:
-        SPRING_REPOSITORY_PASSWORD: ${{ inputs.opensource-repository-password }}
-        SPRING_REPOSITORY_USERNAME: ${{ inputs.opensource-repository-username }}
       run: ./gradlew -PdeploymentRepository=$(pwd)/deployment-repository build dist publishAllPublicationsToDeploymentRepository
     - name: Read Version From gradle.properties
       id: read-version