chore(deps): update opentelemetry-common from 0.19.3 to 0.20.0

[robbkidd]

Common bumped minor when it dropped Ruby 2.7 support. Instrumentation had already dropped Ruby support < 3.0, so this is a patch change to allow instrumentation to coexist with newer -common and therefore also coexist with newer -sdk that requires newer -common.

Another use of Budget Dependabot:

❯ git ls-files \*.gemspec \
  | xargs \
    sed -i '' \
        -E "s/'opentelemetry-common', '~> [[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+'/'opentelemetry-common', '~> 0.20.0'/"

Quick check:

❯ git ls-files \*.gemspec \
  | xargs grep "opentelemetry-common" \
  | wc -l
      13

❯ git ls-files \*.gemspec \
  | xargs grep "opentelemetry-common" \
  | grep "0.20.0" \
  | wc -l
      13