Bump spark-core from 2.1 to 2.7.2 in /old-stuff

[dependabot[bot]]

Bumps spark-core from 2.1 to 2.7.2.

Commits

• 030e9d0 Fix for #981, patch 2 (#988)
• 2723653 preparing for 2.7.2 maintenance release
• 2c29cf3 Update pom.xml (#985)
• db45b56 Fix for #981 (#987)
• 99d7ddc Fix #506 (#971)
• bfda598 Update version in readme (#958)
• e5951a0 POM version -> 3.0.0-SNAPSHOT
• 5316c0d Fixing #941 - Jetty specific import in spark.Request (#942)
• c0d7926 preparing for 2.7.1 release
• b7f955c Update README.md
• Additional commits viewable in compare view

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