pgsql: Mark to_tsvector(regconfig,json[b]) functions immutable

Mark to_tsvector(regconfig,json[b]) functions immutable

This make them consistent with the text function and means they can be
used in functional indexes.

Catalog version bumped.

Per gripe from Josh Berkus.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/f7e6853e1a2ee2badd988f5e49e4ceb6a2b15b7f

Modified Files
--------------
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.h | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)

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