Fix riemann-wrapper
with older Ruby
#290
Merged
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This reverts commit b4254bd.
The YAML.safe_load_file function was added in Psych 3.2.1, but only Ruby
3 and newer provide this version of the Psych library. Since this gem
is supposed to work with older (EOL) Ruby versions, revert this for now.
At some point we will drop support for EOL Ruby, but it will be a
backwards incompatbile change and there is no hurry for that at the
moment, and some supported Linux distro still ship these legacy Ruby
versions.