docs: add release notes for v1.1.50

Author: github-actions[bot]

release_notes/v1.1.50.md

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+## [1.1.50](https://github.com/NHSDigital/eps-FHIR-validator-lambda/compare/v1.1.49...v1.1.50) (2026-02-11)
+
+
+### Upgrade
+
+* [dependabot] - bump aws-actions/configure-aws-credentials from 5.1.1 to 6.0.0 (#427) ([3788dae](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/3788dae7375a924b2ef55b172a121dd609c929be))
+* [dependabot] - bump cfn-lint from 1.43.4 to 1.44.0 (#434) ([402dfe6](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/402dfe6afacf27fe4d4d154354d8c6846e9d6043))
+* [dependabot] - bump com.amazonaws:aws-lambda-java-log4j2 from 1.6.1 to 1.6.2 (#433) ([6fb5e3b](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/6fb5e3bac6ca9a5597796076976b1cef6dff2ba5))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/dependabot-auto-approve-and-merge.yml from 5.3.5 to 5.3.12 (#432) ([e91e4c5](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/e91e4c50cdc913db4164b799ea1f639a4efdbc44))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/pr_title_check.yml from 5.3.5 to 5.3.12 (#430) ([a1efbbe](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/a1efbbe6836fdee3bbfda6722c1f5eacbb81ccfb))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/quality-checks.yml from 5.3.5 to 5.3.12 (#429) ([9d72f4a](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/9d72f4ac60a5bf1a93db7839bc8d29960db21423))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/tag-release.yml from 5.3.5 to 5.3.12 (#426) ([604ef7b](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/604ef7b06340a51560def335b24da99cedcb6dd5))
+* [dependabot] - bump org.apache.maven.plugins:maven-compiler-plugin from 3.14.1 to 3.15.0 (#428) ([ce9204e](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/ce9204e4171f7d4d519dc160838112cc250227eb))
+
+
+
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-FHIR-validator-lambda/actions/runs/21903444139) - Workflow ID: 21903444139
+
+It was initialized by [Orkastrated](https://github.com/Orkastrated)
+
+