[bug#75139] [PATCH] fix guile-dbi and guile-dbd-* to use guile 3

[Josep Bigorra]

Hey so I was busy with Guile and connecting to databases. I noticed
that guile-dbi and guile-dbd-* are depending on Guile-2 without a
reason for that. Changing to 3 did cause some warnings/errors in the
test phase, which I address in this patch.
I noticed that 2.1.9 has some problems with autoconf and configure, so
I suggest we stay at 2.1.8 while we figure it out.
Please close this one btw: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=75136

Thanks in advance,

0001-upgrade-guile-dbi-and-guile-dbd-to-Guile-3.0.patch
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