Bump dependencies

Author: tvdijen

composer.json

@@ -43,11 +43,11 @@
         "ext-pcre": "*",
         "ext-spl": "*",
 
-        "simplesamlphp/assert": "^1.6",
-        "simplesamlphp/xml-common": "^1.22.0"
+        "simplesamlphp/assert": "~1.8.0",
+        "simplesamlphp/xml-common": "~1.24.0"
     },
     "require-dev": {
-        "simplesamlphp/simplesamlphp-test-framework": "^1.8"
+        "simplesamlphp/simplesamlphp-test-framework": "~1.8.0"
     },
     "config": {
         "allow-plugins": {