Bump json from 20180813 to 20210307 in /examples

[dependabot]

Bumps json from 20180813 to 20210307.

Release notes

Sourced from json's releases.

20210307

Pull Request	Description
#575	Fix similar compare numbers
#577	Added clear() methods to JSONObject and JSONArray
#581	Use built-in Gradle shorthand notation for Maven Central repository
#583	Checked the length of key for checker framework
#588	JSONPointer should not process reverse solidus or double-quote chars in tokens

NOTE:

#588 is a potentially breaking change to JSONPointer. Embedded double quote and backslash chars are now handled differently (they are basically ignored by the JSONPointer parser). If this causes problems to your project, post an issue on the JSON-Java GitHub page.

20201115

Pull Request	Description
#515	Merge tests and pom and code
#519	Gradle support
#521	Updates Cookie class to be more generic in attribute parsing and emit
#524	JSONArray does not have constructor to allocate the specified initial capacity
#525	Unit test fixes
#526	Comment out some broken unit tests
#527	Fixes for Unit tests and supports GitHub Actions
#529	Added putAll(Collection) and putAll(Array) methods
#532	Verifies BigDecimal support does not have a regression
#538	Explain local builds in the readme, fix a couple of typos
#539	Bring Junit tests to Java 1.6 compatibility
#540	Added type conversion support
#542	Fix xml hex entity parse
#543	Refactor XMLConfiguration to use Builder Pattern
#549	Update readme.md
#552	Updates for JSONArray.putAll methods
#570	Readme - fix spelling and usage, per Grammarly

20200518

Pull Request	Description
#502	Update JSONTokener text in README
#499	Add copyright to some files
#495	Refactor typos from code
#494	Replace JSONObject constructor string arrays with var args
#492	Clarify output of JSONArray toList()
#486	Standardize some exception messages
#485	Fix EOF error when Meta tag isn't closed at end of input.
#483	Update README.md to point to latest released jar
#481	Clarify exception when parser reads JSON
#475	Make private methods static where possible
#474	Replaces an internally used inefficient StringBuffer class

... (truncated)

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[dependabot]

Superseded by #617.