Fix log exception

[laozhp]

What do these changes do?

Fix log exception, when login mysql using sha256_password_auth, exception throw TypeError: not all arguments converted during string formatting at connection.py:1012

            logger.debug(
                "Received public key:\n",
                self.server_public_key.decode('ascii')
            )

Are there changes in behavior for the user?

No.

Related issue number

Checklist

• [ ] I think the code is well written
• [ ] Unit tests for the changes exist
• [ ] Documentation reflects the changes
• [ ] Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
  • .feature: Signifying a new feature.
  • .bugfix: Signifying a bug fix.
  • .doc: Signifying a documentation improvement.
  • .removal: Signifying a deprecation or removal of public API.
  • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov[bot]]

Codecov Report

Merging #862 (cf2b838) into master (5877a88) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #862   +/-   ##
=======================================
  Coverage   93.64%   93.64%           
=======================================
  Files          36       36           
  Lines        5542     5542           
  Branches      939      939           
=======================================
  Hits         5190     5190           
  Misses        262      262           
  Partials       90       90           

Flag	Coverage Δ
ubuntu-latest_3.10_mariadb-10.3	90.18% <ø> (ø)
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ubuntu-latest_3.10_mariadb-10.5	90.16% <ø> (ø)
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ubuntu-latest_3.10_mariadb-10.7	90.16% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.8	90.16% <ø> (ø)
ubuntu-latest_3.10_mysql-5.7	90.86% <ø> (ø)
ubuntu-latest_3.10_mysql-8.0	92.25% <ø> (ø)
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ubuntu-latest_3.11-dev_mariadb-10.8	90.12% <ø> (ø)
ubuntu-latest_3.11-dev_mysql-5.7	90.83% <ø> (ø)
ubuntu-latest_3.11-dev_mysql-8.0	92.22% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.3	89.63% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.4	89.63% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.5	89.61% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.6	89.61% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.7	89.61% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.8	89.61% <ø> (ø)
ubuntu-latest_3.7_mysql-5.7	90.36% <ø> (ø)
ubuntu-latest_3.7_mysql-8.0	91.83% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.3	90.22% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.4	90.22% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.5	90.20% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.6	90.20% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.7	90.20% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.8	90.20% <ø> (ø)
ubuntu-latest_3.8_mysql-5.7	90.91% <ø> (ø)
ubuntu-latest_3.8_mysql-8.0	92.28% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.3	90.06% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.4	90.06% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.5	90.04% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.6	90.04% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.7	90.04% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.8	90.04% <ø> (ø)
ubuntu-latest_3.9_mysql-5.7	90.74% <ø> (ø)
ubuntu-latest_3.9_mysql-8.0	92.12% <ø> (ø)

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Impacted Files	Coverage Δ
aiomysql/connection.py	84.26% <ø> (ø)

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[laozhp]

change to

            logger.debug(
                "Received public key:\n%s",
                self.server_public_key.decode('ascii')
            )

may be better