docs: list SQLite/libpq versions in docs (#1536)

Fixes #1463.

.env

@@ -37,5 +37,7 @@ ARROW_MAJOR_VERSION=14
 DOTNET=7.0
 
 # Used through docker-compose.yml and serves as the default version for the
-# ci/scripts/install_vcpkg.sh script. Keep in sync with apache/arrow .env
+# ci/scripts/install_vcpkg.sh script. Keep in sync with apache/arrow .env.
+# When updating, also update the docs, which list the version of libpq/SQLite
+# that vcpkg (and hence our wheels) ship
 VCPKG="501db0f17ef6df184fcdbfbe0f87cde2313b6ab1"

docs/source/driver/postgresql.rst

@@ -319,3 +319,12 @@ being read or written.
                 adjusted to the PostgreSQL epoch (2000-01-01) and so may
                 overflow/underflow; an error will be returned if this would be
                 the case.
+
+Software Versions
+=================
+
+For Python wheels, the shipped version of the PostgreSQL client libraries is
+15.2.  For conda-forge packages, the version of libpq is the same as the
+version of libpq in your Conda environment.
+
+The PostgreSQL driver is tested against PostgreSQL versions 11 through 16.

docs/source/driver/sqlite.rst

@@ -273,3 +273,10 @@ Driver-specific options:
 ``adbc.sqlite.query.batch_rows``
     The size of batches to read.  Hence, this also controls how many
     rows are read to infer the Arrow type.
+
+Software Versions
+=================
+
+For Python wheels, the shipped version of SQLite is 3.40.1.  For conda-forge
+packages, the version of sqlite is the same as the version of sqlite in your
+Conda environment.