grep-searcher: update to encoding_rs_io 0.1.3

This update includes a work-around for a presumed bug in encoding_rs
that causes a panic:
https://github.com/hsivonen/encoding_rs/issues/34

Specifically, to reproduce this in ripgrep, one can run the following:

    $ curl -LO https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.1.tar.gz
    $ tar xf ruby-2.5.1.tar.gz
    $ rg ZZZZZ ruby-2.5.1/test/rexml/data/t63-2.svg
    thread 'main' panicked at 'index out of bounds: the len is 1 but the index is 1'

Fixes #1052

grep-searcher/Cargo.toml

@@ -15,7 +15,7 @@ license = "Unlicense/MIT"
 [dependencies]
 bytecount = "0.3.2"
 encoding_rs = "0.8.6"
-encoding_rs_io = "0.1.2"
+encoding_rs_io = "0.1.3"
 grep-matcher = { version = "0.1.1", path = "../grep-matcher" }
 log = "0.4.5"
 memchr = "2.0.2"