Fix typos version to v1.19.0

The reason is that the last release (v1.20.0) includes new aggresive
typos that give false positives. The community is already alerting about
it, eg:
crate-ci/typos#963
crate-ci/typos#967
crate-ci/typos#970
and in our case we were geting 'RO' (random oracle) corrected to 'to',
and 'ws' (array of witnessess) to 'was'.
Keeping with version v1.19.0 while typos gets updated and a new version
is release fixing the false positives.

.github/workflows/ci.yml

@@ -122,6 +122,6 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Use typos with config file
-      uses: crate-ci/typos@master
+      uses: crate-ci/typos@v1.19.0
       with: 
         config: .github/workflows/typos.toml