rust: Bump rustls-webpki to 0.103.12

[peternose]

Crate:     rustls-webpki
Version:   0.102.8
Title:     Name constraints for URI names were incorrectly accepted
Date:      2026-04-14
ID:        RUSTSEC-2026-0098
URL:       https://rustsec.org/advisories/RUSTSEC-2026-0098
Solution:  Upgrade to >=0.103.12, <0.104.0-alpha.1 OR >=0.104.0-alpha.6

Dependency tree:
rustls-webpki 0.102.8
└── rustls-mbedcrypto-provider 0.1.1
    └── simple-rofl 0.0.0

Crate:     rustls-webpki
Version:   0.102.8
Title:     Name constraints were accepted for certificates asserting a wildcard name
Date:      2026-04-14
ID:        RUSTSEC-2026-0099
URL:       https://rustsec.org/advisories/RUSTSEC-2026-0099
Solution:  Upgrade to >=0.103.12, <0.104.0-alpha.1 OR >=0.104.0-alpha.6

Crate:     rustls-webpki
Version:   0.103.10
Title:     Name constraints for URI names were incorrectly accepted
Date:      2026-04-14
ID:        RUSTSEC-2026-0098
URL:       https://rustsec.org/advisories/RUSTSEC-2026-0098
Solution:  Upgrade to >=0.103.12, <0.104.0-alpha.1 OR >=0.104.0-alpha.6

Dependency tree:
rustls-webpki 0.103.10
└── rustls 0.23.36
    ├── simple-rofl 0.0.0
    ├── rustls-mbedtls-provider-utils 0.2.1
    │   ├── rustls-mbedpki-provider 0.2.1
    │   │   └── simple-rofl 0.0.0
    │   └── rustls-mbedcrypto-provider 0.1.1
    │       └── simple-rofl 0.0.0
    ├── rustls-mbedpki-provider 0.2.1
    └── rustls-mbedcrypto-provider 0.1.1

Crate:     rustls-webpki
Version:   0.103.10
Title:     Name constraints were accepted for certificates asserting a wildcard name
Date:      2026-04-14
ID:        RUSTSEC-2026-0099
URL:       https://rustsec.org/advisories/RUSTSEC-2026-0099
Solution:  Upgrade to >=0.103.12, <0.104.0-alpha.1 OR >=0.104.0-alpha.6

[netlify]

✅ Deploy Preview for oasisprotocol-oasis-core canceled.

Name	Link
🔨 Latest commit	6330716
🔍 Latest deploy log	https://app.netlify.com/projects/oasisprotocol-oasis-core/deploys/69df8cff1e00450007240564

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.56%. Comparing base (2391d01) to head (6330716).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6501      +/-   ##
==========================================
- Coverage   64.63%   64.56%   -0.08%     
==========================================
  Files         698      698              
  Lines       68220    68220              
==========================================
- Hits        44097    44043      -54     
- Misses      19103    19127      +24     
- Partials     5020     5050      +30     

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