test: add regression test for go-toml 2.4.x

[amoeba]

go-toml rewrote their serializer in their 2.4.x series and it introduced a
non-consequential serialization difference. We were missing a regression test
that could have caught this so this PR adds that test.

See #406 (comment).

[amoeba]

Fails as expected,

=== RUN   TestMarshalDriverListEmptyTableSection
    driver_list_test.go:150: 
        	Error Trace:	/home/runner/work/dbc/dbc/cmd/dbc/driver_list_test.go:150
        	Error:      	Not equal: 
        	            	expected: "# dbc driver list\n[drivers]\n[drivers.test-driver-1]\n\n[drivers.test-driver-2]\nversion = '>=1.0.0'\n"
        	            	actual  : "# dbc driver list\n[drivers]\n[drivers.test-driver-1]\n[drivers.test-driver-2]\nversion = '>=1.0.0'\n"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -3,3 +3,2 @@
        	            	 [drivers.test-driver-1]
        	            	-
        	            	 [drivers.test-driver-2]
        	Test:       	TestMarshalDriverListEmptyTableSection

See https://github.com/columnar-tech/dbc/actions/runs/29112289291/job/86427264676?pr=415

[amoeba]

CI now passes after I added fccd1bd