CI gcc-4.8 - use 4.8.5 tag

[justsmth]

Problem

The CI job started failing in the last few days.

...
  > [ 1/12] FROM docker.io/library/gcc:4.8@sha256:43c6eaefe26ad414b2eefbee68688d1467823424cacbbd1703da4a50ce2c7654:
------
Dockerfile:4
--------------------
   2 |     # SPDX-License-Identifier: Apache-2.0 OR ISC
   3 |     
   4 | >>> FROM gcc:4.8
   5 |     
   6 |     VOLUME ["/awslc"]
--------------------
ERROR: failed to solve: no signatures
Error: Process completed with exit code 1.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.77%. Comparing base (c9d48a6) to head (5e20933).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1980      +/-   ##
==========================================
- Coverage   78.79%   78.77%   -0.02%     
==========================================
  Files         590      590              
  Lines      101506   101506              
  Branches    14401    14402       +1     
==========================================
- Hits        79979    79966      -13     
- Misses      20891    20903      +12     
- Partials      636      637       +1     

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