fix: remove unsupported arch

[yanksyoon]

Applicable spec:

Overview

According to https://juju.is/docs/sdk/charmcraft-yaml, aarch64 is not one of the archs that is supported. arm64 is though!

Rationale

Juju Events Changes

Module Changes

Library Changes

Checklist

• [x] The charm style guide was applied
• [x] The contributing guide was applied
• [x] The changes are compliant with ISD054 - Managing Charm Complexity
• [x] The documentation is generated using src-docs
• [x] The documentation for charmhub is updated
• [x] The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions[bot]]

Test coverage for e52fdb794cb2e771ff7f182d886d45c57dc85874

Name                               Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------------
src/charm.py                         268     10     80      5    96%   198, 205, 283-285, 322, 360, 411, 552-553
src/consts.py                          4      0      0      0   100%
src/controller/__init__.py             0      0      0      0   100%
src/controller/endpoint_slice.py      55      4     10      4    88%   103, 127, 149, 169
src/controller/endpoints.py           33      1      6      0    92%   53
src/controller/ingress.py            103      8     44      4    89%   60, 80-81, 185, 262->273, 266-268, 271-272
src/controller/resource.py            53      1      9      1    97%   64
src/controller/secret.py              58      8     19      4    79%   53, 71-76, 106->111, 108-110, 111->104, 133, 162
src/controller/service.py             37      1      6      0    93%   51
src/exceptions.py                      3      0      0      0   100%
src/ingress_definition.py            271     26     70      8    89%   41, 70, 174-178, 196, 315-316, 361, 373, 377, 393-394, 409-410, 435, 437, 462-463, 496-497, 504-506, 508
src/tls_relation.py                  130      6     31      1    94%   137, 150-156
------------------------------------------------------------------------------
TOTAL                               1015     65    275     27    92%

Static code analysis report

Run started:2024-08-06 09:33:17.010447

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 4898
    Total lines skipped (#nosec): 11
    Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
    Total issues (by severity):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
    Total issues (by confidence):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
Files skipped (0):