chore(deps): update dependency prometheus/blackbox_exporter to v0.26.0

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This PR contains the following updates:

Package	Update	Change
prometheus/blackbox_exporter	minor	0.25.0 -> 0.26.0

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Release Notes

prometheus/blackbox_exporter (prometheus/blackbox_exporter)

v0.26.0: 0.26.0 / 2025-02-26

Compare Source

• [CHANGE] adopt log/slog, drop go-kit/log #​1311
• [FEATURE] Add metric to record tls ciphersuite negotiated during handshake #​1203
• [FEATURE] Add a way to export labels with content matched by the probe #​1284
• [FEATURE] Reports Certificate Serial number #​1333
• [ENHANCEMENT] Enable misspell linter #​1248
• [ENHANCEMENT] Fix incorrect parameters name in documentation #​1126
• [ENHANCEMENT] Add stale workflow to start sync with stale.yaml in prometheus #​1170
• [ENHANCEMENT] Update CONFIGURATION.md to clarify that valid_status_codes expects a list #​1335
• [ENHANCEMENT] Skip failing IPv6 tests in test CI Pipeline #​1342
• [ENHANCEMENT] Add RabbitMQ probe example #​1349
• [BUGFIX] Only register grpc TLS metrics on successful handshake #​1338

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Test results for commit 0294dca

Test coverage for 0294dca

Name            Stmts   Miss Branch BrPart  Cover   Missing
-----------------------------------------------------------
src/charm.py      210     13     34      8    91%   172-174, 197, 205, 209, 227, 231, 255, 257, 286, 363, 388
src/maubot.py      31      4      2      1    85%   53, 84-86
-----------------------------------------------------------
TOTAL             241     17     36      9    91%

Static code analysis report

Run started:2025-02-28 17:42:00.585823

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1247
  Total lines skipped (#nosec): 1
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):