Fix false negative in outdated-version-block when using greater than comparisons

[zanieb]

Closes #7902

# With target version of Python 3.7
import sys

if sys.version_info >= (3, 7):  # ERROR: UP036
    print('oh no')

if sys.version_info <= (3, 7):  # OK: Can evaluate to different value sometimes e.g. version 3.7 vs 3.8
    print('oh no')

if sys.version_info < (3, 7):  # ERROR: UP036
    print('oh no')

if sys.version_info > (3, 7):  # OK: Can evaluate to different value sometimes e.g. version 3.7 vs 3.8
    print('oh no')

if sys.version_info < (3, 6):  # ERROR: UP036
    print('oh no')

if sys.version_info > (3, 6):  # ERROR: UP036
    print('oh no')

if sys.version_info < (3, 8):  # OK: Can evaluate to a different value sometimes e.g. 3.7 vs 3.8
    print('oh no')

if sys.version_info > (3, 8):  # OK: Can evaluate to a different value sometimes e.g. 3.7 vs 3.9
    print('oh no')

[github-actions]

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[zanieb]

Following the one line fix, I've made some refactors for readability that have no effect on behavior.