[PATCH stable] rust: relax im-rc dependency to allow minor updates

[Mads Kiilerich]

# HG changeset patch
# User Mads Kiilerich <mads at kiilerich.com>
# Date 1653395384 -7200
#      Tue May 24 14:29:44 2022 +0200
# Branch stable
# Node ID 32de89308ead51d42d631c208ab17c866218e1c5
# Parent  1d257c4c15683ee998edcc7dd6caf5a4cb52c820
rust: relax im-rc dependency to allow minor updates

This "15.0.*" requirement came from 0d99778af68a and is now replaced with plain
"15.0".

AFAICS, it really should allow (but not necessarily require) im-rc 15.1 .

Narrow requirement requirements with wildcard in the version is not used in
other places.

diff --git a/rust/hg-core/Cargo.toml b/rust/hg-core/Cargo.toml
--- a/rust/hg-core/Cargo.toml
+++ b/rust/hg-core/Cargo.toml
@@ -14,7 +14,7 @@ bytes-cast = "0.2"
 byteorder = "1.3.4"
 derive_more = "0.99"
 home = "0.5"
-im-rc = "15.0.*"
+im-rc = "15.0"
 itertools = "0.9"
 lazy_static = "1.4.0"
 libc = "0.2"