fix(test): Avoid an over-read in the low-bit-depth sBIT check
fix(test): Correct the sBIT handling in `compare_read`
fix(build): Resolve MSVC warning for unary minus on unsigned type
fix: Restore the build with floating-point support disabled
ci: Enumerate all maintained branches in the GitHub Actions triggers
ci: Enumerate all maintained branches in the GitHub Actions triggers
ci: Enumerate all maintained branches in the GitHub Actions triggers
fix(build): Link `pnggetset` against `libpng2` in the configure build