Create 2.4-branch

Author: tvdijen

.github/workflows/build-release.yml

@@ -1,5 +1,5 @@
 ---
-name: Build assets for SimpleSAMLphp 2.3
+name: Build assets for SimpleSAMLphp 2.4
 
 on:  # yamllint disable-line rule:truthy
   push:

.github/workflows/update-dependencies.yml

@@ -1,5 +1,5 @@
 ---
-name: Update dependencies for SimpleSAMLphp 2.3
+name: Update dependencies for SimpleSAMLphp 2.4
 
 on: workflow_dispatch