adjust timeouts in three more M&M tests

A few more M&M tests are timing out in my stress testing runs.
Here are my notes:

# jdk-21+15_1_linux - observed in jdk-21+15 testing on 2023.03.25 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.957
# jdk-21+16_1_linux - observed in jdk-21+16 testing on 2023.03.30 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 123.078
# jdk-21+16_2_linux - observed in jdk-21+16 testing on 2023.03.31 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.901
# jdk-21+16_3_linux - observed in jdk-21+16 testing on 2023.04.01 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.911
#ZZZ vmTestbase/nsk/monitoring/stress/classload/load007/TestDescription.java XXXXXXX linux-x64

# jdk-21+15_1_linux - observed in jdk-21+15 testing on 2023.03.25 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.86
# jdk-21+16_1_linux - observed in jdk-21+16 testing on 2023.03.30 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.832
# jdk-21+16_2_linux - observed in jdk-21+16 testing on 2023.03.31 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.903
# jdk-21+16_3_linux - observed in jdk-21+16 testing on 2023.04.01 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.843
#ZZZ vmTestbase/nsk/monitoring/stress/classload/load011/TestDescription.java XXXXXXX linux-x64

# jdk-21+15_1_linux - observed in jdk-21+15 testing on 2023.03.25 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 121.979
# jdk-21+16_3_linux - observed in jdk-21+16 testing on 2023.04.01 on
# linux-x64 in slowdebug config:
# - elapsed time (seconds): 122.045
#ZZZ vmTestbase/nsk/monitoring/stress/classload/load012/TestDescription.java XXXXXXX linux-x64