ci: suppress codespell warnings about fixes disabled in dictionary

[AirQuick]

The latest codespell warns a lot about thead ==> thread disabled in dictionary:

$ pip install --upgrade git+https://github.com/codespell-project/codespell.git
...
Successfully installed codespell-1.17.0.dev0
$ codespell --quiet-level 2 --skip=".git,./src/schematron/iso-schematron"
./src/reporter/format-xspec-report.xsl:223: thead  ==> thread  | disabled due to the html tag
./src/reporter/format-xspec-report.xsl:232: thead  ==> thread  | disabled due to the html tag
./src/reporter/format-xspec-report.xsl:328: thead  ==> thread  | disabled due to the html tag
./src/reporter/format-xspec-report.xsl:338: thead  ==> thread  | disabled due to the html tag
./test/xspec-param-position.xspec:20: poisition  ==> position
...

The warnings are too many. To suppress it, this pull request adds bitmask 4 to QUIET_LEVEL:

$ codespell --quiet-level 6 --skip=".git,./src/schematron/iso-schematron"
./test/xspec-param-position.xspec:20: poisition  ==> position

(poisition is addressed in #774.)

[commit-lint]

Continuous Integration

• suppress codespell warnings about fixes disabled in dictionary (355d791)

Contributors

@AirQuick

[AirQuick]

Merging this to facilitate local pre-commit hook.