Revert "Throttle Sceptre deployment (#1498)" (#1516)

This reverts commit 5e0713e.

Sceptre was released v4.60 with a concurrency option to throttle deployments.
Update to use the latest upststream version instead of using the private
version.

Author: zaro0508

.github/workflows/aws-deploy.yaml

@@ -45,7 +45,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install git+https://github.com/zaro0508/sceptre@max-concurrency sceptre-json-resolver sceptre-request-resolver sceptre-ssm-resolver
+          pip install sceptre sceptre-json-resolver sceptre-request-resolver sceptre-ssm-resolver
       - name: Assume AWS Role
         uses: aws-actions/configure-aws-credentials@v2
         with:

.github/workflows/aws-scipool.yaml

@@ -49,7 +49,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install git+https://github.com/zaro0508/sceptre@max-concurrency sceptre-json-resolver sceptre-request-resolver sceptre-ssm-resolver
+          pip install sceptre sceptre-json-resolver sceptre-request-resolver sceptre-ssm-resolver
       - name: Assume AWS Role
         uses: aws-actions/configure-aws-credentials@v2
         with: