[releases/3.1] chore: Update project versions

[github-actions]

This PR updates the versions of the following Python projects:

Project	Version	Path
ni_measurement_plugin_sdk_generator	3.1.1.dev0	packages/generator/pyproject.toml
ni_measurement_plugin_sdk	3.1.1.dev0	packages/sdk/pyproject.toml
ni_measurement_plugin_sdk_service	3.1.1.dev0	packages/service/pyproject.toml

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[github-actions]

Test Results

    52 files  ±0      52 suites  ±0   1h 27m 56s ⏱️ + 8m 33s
   689 tests ±0     689 ✅ ±0      0 💤 ±0  0 ❌ ±0 
20 700 runs  ±0  19 644 ✅ ±0  1 056 💤 ±0  0 ❌ ±0 

Results for commit 19bc175. ± Comparison against base commit c4a05f0.