Use suppress from contextlib

[emcek]

Description

Replace try/except with suppress:

try:
    del cfg[old_name]
except KeyError:
    pass

with this:

from contextlib import suppress

with suppress(KeyError):
    del cfg[old_name]

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
97.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coveralls]

coverage: 97.517% (+0.1%) from 97.401%
when pulling daf5e7b on with_suppress
into 92ab3f7 on master.

[codspeed-hq]

Merging this PR will degrade performance by 13.06%

❌ 1 regressed benchmark
✅ 370 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	test_get_gkey_as_dict_key	94.5 µs	108.7 µs	-13.06%

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_{Comparing with_suppress (daf5e7b) with master (92ab3f7)}