Fix Erlang version for GitHub Actions

[gustawlippa]

Currently, Erlang does not download on GitHub Actions, which we use to test the master branch. See
https://github.com/esl/MongooseIM/actions/runs/8971880579 for example.
The issue was with the new scripts that download the Erlang package from our website.
The fix is taken from 05f03eb from #4273.

I've run GH Actions for this branch manually, and the packages jobs have passed: https://github.com/esl/MongooseIM/actions/runs/8984746064.
There are some red results, but they should be unrelated (flaky tests?).

[mongoose-im]

elasticsearch_and_cassandra_26 / elasticsearch_and_cassandra_mnesia / 24cc98c
Reports root/ big
OK: 437 / Failed: 0 / User-skipped: 43 / Auto-skipped: 0

---

small_tests_25 / small_tests / 24cc98c
Reports root / small

---

small_tests_26 / small_tests / 24cc98c
Reports root / small

---

small_tests_26_arm64 / small_tests / 24cc98c
Reports root / small

---

dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / 24cc98c
Reports root/ big
OK: 4543 / Failed: 0 / User-skipped: 111 / Auto-skipped: 0

---

ldap_mnesia_25 / ldap_mnesia / 24cc98c
Reports root/ big
OK: 2286 / Failed: 0 / User-skipped: 897 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_26 / mysql_redis / 24cc98c
Reports root/ big
OK: 4510 / Failed: 0 / User-skipped: 144 / Auto-skipped: 0

---

ldap_mnesia_26 / ldap_mnesia / 24cc98c
Reports root/ big
OK: 2286 / Failed: 0 / User-skipped: 897 / Auto-skipped: 0

---

pgsql_cets_26 / pgsql_cets / 24cc98c
Reports root/ big
OK: 4458 / Failed: 0 / User-skipped: 178 / Auto-skipped: 0

---

internal_mnesia_26 / internal_mnesia / 24cc98c
Reports root/ big
OK: 2426 / Failed: 0 / User-skipped: 757 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_26 / odbc_mssql_mnesia / 24cc98c
Reports root/ big
OK: 4540 / Failed: 0 / User-skipped: 114 / Auto-skipped: 0

---

pgsql_mnesia_25 / pgsql_mnesia / 24cc98c
Reports root/ big
OK: 4932 / Failed: 0 / User-skipped: 118 / Auto-skipped: 0

---

dynamic_domains_pgsql_mnesia_26 / pgsql_mnesia / 24cc98c
Reports root/ big
OK: 4543 / Failed: 0 / User-skipped: 111 / Auto-skipped: 0

---

mysql_redis_26 / mysql_redis / 24cc98c
Reports root/ big
OK: 4911 / Failed: 0 / User-skipped: 139 / Auto-skipped: 0

---

pgsql_mnesia_26 / pgsql_mnesia / 24cc98c
Reports root/ big
OK: 4932 / Failed: 0 / User-skipped: 118 / Auto-skipped: 0

---

mssql_mnesia_26 / odbc_mssql_mnesia / 24cc98c
Reports root/ big
OK: 4929 / Failed: 0 / User-skipped: 121 / Auto-skipped: 0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.43%. Comparing base (703cfbd) to head (24cc98c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4276   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         553      553           
  Lines       33582    33582           
=======================================
+ Hits        28354    28356    +2     
+ Misses       5228     5226    -2     

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[arcusfelis]

good