[SPARK-56812][INFRA] Fix URL of get-pip.py in dev/infra/Dockerfile for Python 3.9 - #55788

[SPARK-56812][INFRA] Fix URL of get-pip.py in dev/infra/Dockerfile for Python 3.9#55788

sarutak wants to merge 1 commit into

apache:masterapache/spark:masterfrom

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