Johnny Lim

This PR changes to use HTTPS for license link in the `README.md` file.

#### Check List: * Fixes #??? (ignore if not applicable) * Unit tests : YES / NO / NA * Javadoc with a code example (on API only) : YES...

This PR adds warning logs for deprecated classes in the `httpcomponents` package. Closes gh-4576

It failed on CI as follows: ``` MongoMetricsCommandListenerTest > shouldCreateFailedCommandMetricWithCustomSettings() FAILED io.micrometer.core.instrument.search.MeterNotFoundException: Unable to find a meter that matches all the requirements at once. Here's what was found: OK: A...

This PR fixes a typo.

This PR changes to use `ConcurrentHashMap.newKeySet()` where feasible. See https://github.com/spring-projects/spring-framework/pull/32294

Consider restoring support for include directive with relative path

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Before Asciidoctor Gradle plugin 2.x, `include` directive with relative path works but I didn't find any way to achieve the same with Asciidoctor Gradle plugin 2.x. I can change them...

Polish

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This PR polishes a bit.

https://spring.io/guides/gs/spring-boot-docker/ gives 404

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https://spring.io/guides/gs/spring-boot-docker/ gives 404 now.

This PR polishes docs a bit.