[infra] Update Hugo to 0.120.3 and netlify-cli

[chalin]

Upgrades Hugo. There are changes to the generated site files, but only due to Java syntax-highlight fixes (cf. google/docsy#1701):

$ (cd public && git diff -bw --ignore-blank-lines -I "Hugo 0.1" -- . ':(exclude)*.xml') | grep ^diff | grep -v site/index
diff --git a/blog/2022/exponential-histograms/index.html b/blog/2022/exponential-histograms/index.html
diff --git a/blog/2022/instrument-kafka-clients/index.html b/blog/2022/instrument-kafka-clients/index.html
diff --git a/docs/concepts/instrumentation/libraries/index.html b/docs/concepts/instrumentation/libraries/index.html
diff --git a/docs/demo/services/ad/index.html b/docs/demo/services/ad/index.html
diff --git a/docs/instrumentation/java/automatic/annotations/index.html b/docs/instrumentation/java/automatic/annotations/index.html
diff --git a/docs/instrumentation/java/exporters/index.html b/docs/instrumentation/java/exporters/index.html
diff --git a/docs/instrumentation/java/getting-started/index.html b/docs/instrumentation/java/getting-started/index.html
diff --git a/docs/instrumentation/java/manual/index.html b/docs/instrumentation/java/manual/index.html
diff --git a/docs/instrumentation/java/resources/index.html b/docs/instrumentation/java/resources/index.html
diff --git a/docs/specs/otel/compatibility/opentracing/index.html b/docs/specs/otel/compatibility/opentracing/index.html
diff --git a/docs/specs/otel/error-handling/index.html b/docs/specs/otel/error-handling/index.html
diff --git a/docs/specs/otel/logs/sdk/index.html b/docs/specs/otel/logs/sdk/index.html
diff --git a/docs/specs/otel/metrics/api/index.html b/docs/specs/otel/metrics/api/index.html
diff --git a/docs/specs/otel/trace/exceptions/index.html b/docs/specs/otel/trace/exceptions/index.html
diff --git a/docs/specs/otel/trace/sdk/index.html b/docs/specs/otel/trace/sdk/index.html
diff --git a/docs/specs/semconv/exceptions/exceptions-spans/index.html b/docs/specs/semconv/exceptions/exceptions-spans/index.html