DetCommon LCG Version Fix, master branch (2022.12.08.)

While doing various updates to our projects today, I noticed that I missed a mistake in !58081 (merged). 😦

You see, DetCommon should've been set up to use LCG_102b and not LCG_102. The two have (I guess most importantly) different versions of ROOT. So I fear the current nightly is quite the ticking time bomb. 😦

Pinging @elmsheus and @fwinkl.

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