DASH-IF Conformance Tools v2.2.3

What's Changed

• Fix multiple bugs when checking for elements in the DVB testsuite by @dsilhavy in #678
• Fix error message for the DVB UTCTiming element check by @dsilhavy in #679
• Adjust CI/CD jobs to reflect new EC2 server config by @dsilhavy in #682
• Ignore empty lines from segment validation output to remove trailing check mark by @dsilhavy in #683
• Fix usage of wrong global variables for saving codec information by @dsilhavy in #685
• Fix count for contentProtection elements in DVB test by @dsilhavy in #686
• Remove doctype tag from test result output to avoid creating an invalid JSON by @dsilhavy in 5faeee7