fix(examples): Example CA certs must contain the Key Usage parameter

- Example CA certificates that are used for self-signed client certificates
need to include the Key Usage parameter.
- Python3.13 changed the default context of the SSL context that is
generated using ssl.create_default_context() by enabling the VERIFY_X509_STRICT
flag by default

examples/protocols/https_server/wss_server/README.md

@@ -53,7 +53,7 @@ as trusted.
 You can generate a new certificate using the OpenSSL command line tool:
 
 ```
-openssl req -newkey rsa:2048 -nodes -keyout prvtkey.pem -x509 -days 3650 -out cacert.pem -subj "/CN=ESP32 HTTPS server example"
+openssl req -newkey rsa:2048 -nodes -keyout prvtkey.pem -x509 -days 3650 -out servercert.pem -subj "/CN=ESP32 HTTPS server example" -addext "keyUsage=critical,digitalSignature,keyCertSign"
 ```
 
 Expiry time and metadata fields can be adjusted in the invocation.

examples/protocols/https_server/wss_server/main/certs/servercert.pem

@@ -1,19 +1,20 @@
 -----BEGIN CERTIFICATE-----
-MIIDKzCCAhOgAwIBAgIUBxM3WJf2bP12kAfqhmhhjZWv0ukwDQYJKoZIhvcNAQEL
-BQAwJTEjMCEGA1UEAwwaRVNQMzIgSFRUUFMgc2VydmVyIGV4YW1wbGUwHhcNMTgx
-MDE3MTEzMjU3WhcNMjgxMDE0MTEzMjU3WjAlMSMwIQYDVQQDDBpFU1AzMiBIVFRQ
+MIIDOzCCAiOgAwIBAgIUGtx0JiogvT3DlTnZ3+tAT7Tr5JEwDQYJKoZIhvcNAQEL
+BQAwJTEjMCEGA1UEAwwaRVNQMzIgSFRUUFMgc2VydmVyIGV4YW1wbGUwHhcNMjUw
+NDAyMDcwNzE1WhcNMzUwMzMxMDcwNzE1WjAlMSMwIQYDVQQDDBpFU1AzMiBIVFRQ
 UyBzZXJ2ZXIgZXhhbXBsZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB
 ALBint6nP77RCQcmKgwPtTsGK0uClxg+LwKJ3WXuye3oqnnjqJCwMEneXzGdG09T
 sA0SyNPwrEgebLCH80an3gWU4pHDdqGHfJQa2jBL290e/5L5MB+6PTs2NKcojK/k
 qcZkn58MWXhDW1NpAnJtjVniK2Ksvr/YIYSbyD+JiEs0MGxEx+kOl9d7hRHJaIzd
 GF/vO2pl295v1qXekAlkgNMtYIVAjUy9CMpqaQBCQRL+BmPSJRkXBsYk8GPnieS4
 sUsp53DsNvCCtWDT6fd9D1v+BB6nDk/FCPKhtjYOwOAZlX4wWNSZpRNr5dfrxKsb
-jAn4PCuR2akdF4G8WLUeDWECAwEAAaNTMFEwHQYDVR0OBBYEFMnmdJKOEepXrHI/
+jAn4PCuR2akdF4G8WLUeDWECAwEAAaNjMGEwHQYDVR0OBBYEFMnmdJKOEepXrHI/
 ivM6mVqJgAX8MB8GA1UdIwQYMBaAFMnmdJKOEepXrHI/ivM6mVqJgAX8MA8GA1Ud
-EwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBADiXIGEkSsN0SLSfCF1VNWO3
-emBurfOcDq4EGEaxRKAU0814VEmU87btIDx80+z5Dbf+GGHCPrY7odIkxGNn0DJY
-W1WcF+DOcbiWoUN6DTkAML0SMnp8aGj9ffx3x+qoggT+vGdWVVA4pgwqZT7Ybntx
-bkzcNFW0sqmCv4IN1t4w6L0A87ZwsNwVpre/j6uyBw7s8YoJHDLRFT6g7qgn0tcN
-ZufhNISvgWCVJQy/SZjNBHSpnIdCUSJAeTY2mkM4sGxY0Widk8LnjydxZUSxC3Nl
-hb6pnMh3jRq4h0+5CZielA4/a+TdrNPv/qok67ot/XJdY3qHCCd8O2b14OVq9jo=
+EwEB/wQFMAMBAf8wDgYDVR0PAQH/BAQDAgKEMA0GCSqGSIb3DQEBCwUAA4IBAQAT
+lpY3s1IAV369xl7cri72ErqFRBveKvJCaq/1l0FSH1w/u3SxABQw9SH29Lg0hbAa
+jotcCMo4XZpmKSsQn0Zs4ZgKh1zk90JZVtssWuU3y8ftq9t4JjskRHTF19yp7CCC
+zKIHPlCyYjCgw3tWhrsWa95dF3ebVrPkuUfd6CCxe8OB4EC74svI+uuxA7Ud9Jtx
+Dno5yFu7NKpRLSwFqJnxbU0bZp434v2vcexkbvZP0Z2AW+C2L+x90xcP5rW2vL+a
+S0bj0quNH43cGKbBFzE9cLy04xsGlOqzYSQcFbGeT9LyQBLFZtp6QlC97ZsQ78fG
+A2PRPwcF0QCvQrT42b8y
 -----END CERTIFICATE-----