Drop support for Jena 5.3

[Ostrzyciel]

This was previously required mainly for jelly-cli, but it's upgrading to Jena 6: Jelly-RDF/cli#308

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...blink/jelly/convert/jena/JenaDecoderConverter.java	0.00%	1 Missing ⚠️
...blink/jelly/convert/jena/JenaEncoderConverter.java	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...blink/jelly/convert/jena/JenaDecoderConverter.java	45.45% <0.00%> (ø)	0.00 <0.00> (ø)
...blink/jelly/convert/jena/JenaEncoderConverter.java	38.46% <0.00%> (ø)	0.00 <0.00> (ø)

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[Ostrzyciel]

Superseded by #711