TA#86177 Upgrade CircleCI config from version 2.0 to 2.1

[qtiplb]

CircleCI has deprecated version 2.0. This PR updates the configuration:

• Changes the global version from 2.0 to 2.1
• Removes the version key from workflows section (not used in 2.1)

Related task: TA#86177

[codacy-production]

Not up to standards ⛔

🟢 Coverage ∅ diff coverage

Metric	Results
Coverage variation	Report missing for c434e091
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c434e09)	Report Missing	Report Missing	Report Missing
Head commit (9c63f26)	8432	8065	95.65%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#611)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

¹ Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct.

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TIP This summary will be updated as you push new changes.}