android: Update catch2 to v2.7.0

Local change aosp/729005 is not necessary any more. Upstream has similar
change:
https://github.com/catchorg/Catch2/commit/8b0188385498d6ac101854dc3983c6ebd220adc3

Test: run both libcatch2-test and libcatch2-test-upstream on both host and target
Test: run librxcpp-tests --nothrow and librxcpp-tests-upstream
Change-Id: If321d27164aa70a88b7c1aec11cfa71d3b8e574d