fix(core): Fix dotnet version check to allow .NET 7.0 (#24467)

Fix dotnet version check to allow .NET 7.0

Closes #24466.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: markusl

scripts/check-build-prerequisites.sh

@@ -127,7 +127,7 @@ app_min="6.0.100"
 check_which $app $app_min
 app_v=$(${app} --list-sdks)
 echo -e "Checking dotnet version... \c"
-if [ $(echo $app_v | grep -c -E "6\.[0-9]+\.[0-9]+") -eq 1 ]
+if [ $(echo $app_v | grep -c -E "[67]\.[0-9]+\.[0-9]+") -eq 1 ]
 then
     echo "Ok"
 else