deps: bump idna to 7.1.0, remove string_compat usage

- Update idna dependency from 6.1.0 to 7.1.0
- Replace string_compat:to_lower/1 with string:lowercase/1
- Replace string_compat:strip/3 with string:trim/3

string_compat was provided by the old idna/unicode_util_compat stack
and is no longer needed with modern Erlang stdlib.

Author: benoitc

rebar.config

@@ -45,7 +45,7 @@
              ]}.
 
 {deps, [
-        {idna, "~>6.1.0"},
+        {idna, "~>7.1.0"},
         {mimerl, "~>1.4"},
         {certifi, "~>2.15.0"},
         {parse_trans, "3.4.1"},

src/hackney_pool.erl

@@ -426,7 +426,7 @@ handle_call({count, Key}, _From, #state{available=Available}=State) ->
 
 handle_call({host_stats, Host, Port}, _From, #state{available=Available, in_use=InUse}=State) ->
     %% Count in_use and free for this host (any transport)
-    HostLower = string_compat:to_lower(Host),
+    HostLower = string:lowercase(Host),
     InUseCount = maps:fold(
         fun(_Pid, {H, P, _T}, Acc) when H =:= HostLower, P =:= Port -> Acc + 1;
            (_, _, Acc) -> Acc
@@ -708,7 +708,7 @@ terminate(_Reason, #state{name=PoolName, available=Available,
 %%====================================================================
 
 connection_key(Host0, Port, Transport) ->
-    Host = string_compat:to_lower(Host0),
+    Host = string:lowercase(Host0),
     {Host, Port, Transport}.
 
 find_available(Key, Available) ->

src/hackney_ssl.erl

@@ -81,7 +81,7 @@ merge_ssl_opts(Host, OverrideOpts, Options) ->
 
 
 check_hostname_opts(Host0) ->
-  Host1 = string_compat:strip(Host0, right, $.),
+  Host1 = string:trim(Host0, trailing, "."),
   VerifyFun = {
     fun ssl_verify_hostname:verify_fun/3,
     [{check_hostname, Host1}]