Ignore unrecognized messages in bridge counter processes

[vbaranov]

Motivation

2021-02-10T09:46:14.726 [error] GenServer Explorer.Counters.Bridge terminating
** (FunctionClauseError) no function clause matching in Explorer.Counters.Bridge.handle_info/2
    (explorer 0.0.1) lib/explorer/counters/bridge.ex:92: Explorer.Counters.Bridge.handle_info({:ssl_closed, {:sslsocket, {:gen_tcp, #Port<0.2302>, :tls_connection, :undefined}, [#PID<0.10152.0>, #PID<0.10150.0>]}}, %{consolidate?: true})
    (stdlib 3.13) gen_server.erl:680: :gen_server.try_dispatch/4
    (stdlib 3.13) gen_server.erl:756: :gen_server.handle_msg/6
    (stdlib 3.13) proc_lib.erl:226: :proc_lib.init_p_do_apply/3
Last message: {:ssl_closed, {:sslsocket, {:gen_tcp, #Port<0.2302>, :tls_connection, :undefined}, [#PID<0.10152.0>, #PID<0.10150.0>]}}
State: %{consolidate?: true}

Changelog

Add default function clause for handle_info

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[coveralls]

Pull Request Test Coverage Report for Build 4d0bf3566aabcceca521e0c9e909f1059f008bc8-PR-3623

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.07%) to 65.017%

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Totals
Change from base Build 392317e258fa9d432b45f1be3492e637c8e8fbfb:	-2.07%
Covered Lines:	2102
Relevant Lines:	3233

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💛 - Coveralls