Bump spark.version from 2.4.3 to 2.4.8#17

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dependabot[bot] wants to merge 3 commits intorel/0.12from

dependabot/maven/rel/0.12/spark.version-2.4.8

Commits on Sep 14, 2021

[IOTDB-1629] fix the NPE when using value fill in cluster mode (#3913)
cornmonster
committed

Commits on Oct 9, 2021

Merge branch 'apache:rel/0.12' into rel/0.12
cornmonster
authored

Commits on Nov 17, 2021

Bump spark.version from 2.4.3 to 2.4.8
dependabot[bot]
authored