Update to 1.16 and remove unnecessary pinning

[jdblischak]

I recently rebuilt m2w64-htslib with htslib 1.16

TileDB-Inc/m2w64-htslib-build#3
https://github.com/TileDB-Inc/m2w64-htslib-build/releases/tag/1.16-0

motivation: TileDB-Inc/tiledb-vcf-feedstock#106

[jdblischak]

pin_run_as_build and run_exports are different mechanisms for achieving the same result, ie pinning the runtime dependency to use the same version at build time. This recipe already uses run_exports, so also including pin_run_as_build is redundant. Also, conda-forge has decided to prefer run_exports over pin_run_as_build

Note that bioconda continues to include htslib in its pin_run_as_build in conda_build_config.yaml.

https://github.com/bioconda/bioconda-utils/blob/8255afdd9e5c0fd3cb09cb11269f5ff3397c959e/bioconda_utils/bioconda_utils-conda_build_config.yaml#L15

However, that is a different situation. Their conda_build_config.yaml is applied when building any bioconda recipe, whereas the one in this feedstock is only applied for building this recipe. Thus if a bioconda recipe is for some reason built against a very old htslib that doesn't have run_exports, it would still be pinned properly at runtime

[jdblischak]

This is unnecessary for various reasons.

First, as above, this conda_build_config.yaml is only applied when building the recipe in this feedstock. My original motivation for including this was to match the upstream bioconda conda_build_config.yaml, but I now realize that this wasn't achieving the same goal. Since it only applies to this recipe, it only pins it for this recipe, and is thus just an additional place where we need to manually bump the version.

Second, bioconda no longer pins htslib globally (bioconda/bioconda-utils#917) since it has relaxed the htslib pins for all existing recipes (bioconda/bioconda-recipes#42895)

[jdblischak]

Also, for documentation, here is how I calculated the sha256:

wget https://github.com/TileDB-Inc/m2w64-htslib-build/releases/download/1.16-0/m2w64-htslib-1.16-0.tar.gz
openssl sha256 m2w64-htslib-1.16-0.tar.gz
## SHA2-256(m2w64-htslib-1.16-0.tar.gz)= ac6a03e561eba22b9de0fd93e6b3d5aea0c72a5981e6a8157a24c8799bd3a8aa