Update GitHub Actions and dependency compatibility bounds#87

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Copilot wants to merge 15 commits intomainfrom

copilot/perform-package-maintenance

Commits on Oct 31, 2025

Initial plan
Copilot
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Update GitHub Actions to latest versions

Copilot
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jeremiahpslewis
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Update package compatibility bounds and upgrade dependencies

Copilot
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jeremiahpslewis
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Fix oxigraph_server command syntax for updated version

Copilot
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jeremiahpslewis
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Fix DataFrames reduce/vcat syntax for v1.8 compatibility

Copilot
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jeremiahpslewis
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Handle empty query results in vcat operation

Copilot
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jeremiahpslewis
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Handle empty DataFrames in unpack_value_cols

Copilot
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jeremiahpslewis
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Prepopulate column names for empty SPARQL results

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jeremiahpslewis
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Commits on Nov 2, 2025