renovate: fix the way we manually install Go inside the runner #1584
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This is a follow-up of #1579 because #1577 is broken.
This simplifies a49c4bc that causes issues in the case of the new Go toolchain feature. It was manually installing a version off-by-one, like 1.21.2 for 1.21.3 present in the just updated go.mod and thus triggering the automatic download of the 1.21.3 toolchain. But in the renovate container env, GOSUMDB is set to off for some reason which blocks the download of the toolchain.
This simplifies the manual install by reading the go.mod file to determine the correct version, allowing to remove the bump of the number in the renovate config itself.